# IRWIN IWHT48445 Strait-Line Mach 6 Chalk Reel with 6:1 Gear Ratio

Set out straight chalk lines and rewind smoothly with the IRWIN Strait-Line Mach 6 Reel, featuring a 6:1 planetary gear ratio.

- [Original product page](https://www.ofertitastop.com/ca/product/irwin-iwht48445-strait-line-mach-chalk)
- [View offer](https://www.ofertitastop.com/ca/visit/irwin-iwht48445-strait-line-mach-chalk)
- Market: CA
- Language: en-CA
- Currency: CAD
- Product updated: 2026-10-19T08:08:16.620Z
- Brand: IRWIN
- Model: IWHT48445
- MPN: IWHT48445
- EAN / GTIN: 885911819220
- SKU: ofertitastop-ca-17702
- Category: Hardware > Tools > Marking Tools
- Source store: amazon CA
- Active deal: Yes
- Price: 17.98 CAD
- Previous price: 19.99 CAD
- Discount: 10%
- Rating: 4.1 / 5
- Reviews: 14

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## Description

For layout work that calls for clear, straight chalk lines, the IRWIN Strait-Line Mach 6 Reel combines a high-tensile line with a reel designed for practical jobsite use. Its wide-prong hook helps anchor the line securely, giving you a useful starting point for marking out a work area.

If your priority is quick chalk refills and line changes, the large quarter-turn locking top and open-access back panel make those tasks easier to reach. If you’re focused on winding the line back in comfortably, the slim profile, fishing reel-style knob and 6:1 planetary gear ratio support smooth retraction.

The result is a manual chalk reel for people who want an efficient layout tool with thoughtful details for filling, anchoring and rewinding. It brings those functions together in a durable, impact-resistant aluminium housing.

## Pros

The high-tensile line is designed to resist breakage when it contacts abrasive surfaces, helping it stand up to the demands of marking on rougher work areas. A wide-prong hook provides secure anchoring, so the line has a firm point to work from as you set out a mark.

For repeated use, the fishing reel-style knob offers a convenient grip while winding, and the slim profile makes the reel comfortable to handle. Its 6:1 planetary gear ratio is designed for smooth line retraction and longer gear life. The impact-resistant aluminium housing adds protection against jobsite wear and tear, while the spool design helps preserve the line and aerate chalk.

## Key points

The large quarter-turn locking top is designed to improve visibility during chalk refills, making it easier to see the opening as you replenish the reel. The open-access back panel also gives you access for line changes and cleaning, useful when the tool is being used regularly or needs attention between layout tasks.

In practice, the wide-prong hook helps hold the line at its starting point while you position it for a mark. Once the line is set, the reel’s chalk-marking format suits layout tasks where a straight line is more useful than measuring and marking a series of separate points. The manual winding knob then helps bring the line back in after use.

## Maintenance

The open-access back panel is designed to make cleaning and line changes more straightforward. When the reel needs cleaning or a fresh line, use that access point to reach the spool area. For refilling chalk, the large quarter-turn locking top provides access through the top of the reel.

## Before you decide

**How do you refill the chalk reel?** The large top uses a quarter-turn locking design. Its increased visibility is intended to make refills easier to manage.

**What helps the line stay anchored during layout?** The reel has a wide-prong hook for secure anchoring, giving the line a stable point as you position it for marking.

**What makes winding the line back in more comfortable?** The slim profile and fishing reel-style knob are designed for low-strain handling, while the 6:1 planetary gear ratio supports smooth retraction.

## When it makes sense

It suits you if your layout work benefits from a chalk line that can be anchored, marked out and rewound using one manual reel. Choose it for practical details that support regular jobsite use: a high-tensile line, a secure wide-prong hook, accessible refill and cleaning points, and an impact-resistant aluminium housing. The Mach 6 brings those features together for efficient straight-line marking and convenient line recovery.

## Images

![IRWIN IWHT48445 Strait-Line Mach 6 Chalk Reel with 6:1 Gear Ratio — 1](https://www.ofertitastop.com/i/f_WPKtE-tpQbfL7W62zomjuvidPorqx2EQYI7i2BZp7pEgAeWWn6OO5yxT8rTguN-3TeaGe9BMdyTOp9KhbSaZtjgaOPJ7CLMOxXrxxmfTF2Q1NtnMHG828OJQ.jpg)

![IRWIN IWHT48445 Strait-Line Mach 6 Chalk Reel with 6:1 Gear Ratio — 2](https://www.ofertitastop.com/i/yDYe6cq9lCOHGkHXEiLmXpXGuz3xLEdJNamjbUh3GM4YTB0vlmgiKGbwqH4AFZjMff3TcV9deFnS1dTpzftDRWdF_jbJrpIKrxlUXseZco1xEuM02h446fCSKg.jpg)

![IRWIN IWHT48445 Strait-Line Mach 6 Chalk Reel with 6:1 Gear Ratio — 3](https://www.ofertitastop.com/i/DmyVj8tgfM-mBHQWgi6svkJ5P7g3oswBU7YYKRJzdGLIcPbSU3VRkCqISN4M-Fv3eTbjmwIZcVeIPqslZ3-nPYXOqndMYuc4aYvvdBmEs9-LLi2vjUsubRN5eg.jpg)

![IRWIN IWHT48445 Strait-Line Mach 6 Chalk Reel with 6:1 Gear Ratio — 4](https://www.ofertitastop.com/i/UTtkhy7JmZ__OiOQLcgI6IkJfpD_ItyrgHOsVbhitL9g0HfLgBpbANJFKZIPOpMVzMqXdlmo5Dtm6vEGRBikwLjhpEer5hO6PSVxTZo54VdPLH3O3ofyLk-gbA.jpg)

![IRWIN IWHT48445 Strait-Line Mach 6 Chalk Reel with 6:1 Gear Ratio — 5](https://www.ofertitastop.com/i/IsQ2I9HO6AufpRktdNevy4Cbduf2TXfBntvJ14VFK8iae-_6hdujxqF27wHHuN9ZHfsR0K3t6BKFhDPCfqA98plJoVCComidYsQhSL7Lr5o7zEA3FwlVKbM1dA.jpg)