Kolvoii metal hole saw, 115 mm

Highlights

For metalworkers and DIYers making a large circular opening in sheet metal, this Kolvoii hole saw has a 115 mm cutting diameter and tungsten carbide-tipped teeth.

It’s specified for stainless steel, iron, aluminium, mild steel and sheet metal. The kit includes a titanium-coated pilot bit, an ejector spring and a hex wrench.

The three-blade design is intended to help distribute cutting contact, while the pilot bit helps follow a centre mark at startup. Keep in mind that the cutting depth is 25 mm, so thicker material may not suit this cutter.

Best use cases

The 115 mm opening is suited to jobs such as exhaust collars, round duct openings, vent access and equipment enclosures. It’s a more specialised choice than a general-purpose hole saw: the carbide-tipped cutting edge is intended for metal, rather than wood or masonry. It is not for concrete, tile or stone.

The 10 mm three-flat shank fits adjustable drill chucks of 3/8 in or larger. The listing also names magnetic drills and corded and cordless drills as compatible types, but the chuck still needs to meet that minimum size. If your drill has a smaller chuck, this is not the right fit.

Tips for day-to-day use

Mark the centre, start at low speed and apply steady pressure. The pilot bit is designed to help keep the cutter on the mark as it starts. Cutting oil is recommended to help manage heat and tooth wear, eye protection is also called for in the product instructions.

For example, when cutting a vent opening in sheet metal, first confirm the material is within the 25 mm cutting depth, then centre the pilot bit and work steadily rather than forcing the saw. The spring is there to eject the metal slug, which may be useful when making repeated openings. The listed kit contents do not include cutting oil, so that needs to be sourced separately if you plan to use it.

Three specific questions

Can it cut stainless steel? The product is specified for stainless steel, along with iron, aluminium, mild steel and sheet metal. The listing does not give a particular grade or thickness for each material.

Will it fit my drill? It fits adjustable chucks of 3/8 in or larger. Check your chuck size before choosing it, the shank is 10 mm with three flats.

What comes in the kit? The hole saw, a titanium-coated pilot bit, an ejector spring and a hex wrench are listed.

Is it worth it?

It may suit you if you need a 115 mm opening in compatible metal and your drill accepts the shank. For a one-off hole in a thinner sheet, a simpler cutter may be enough, for thicker stock or non-metal materials, this product’s stated depth and material range are a poor match. It may not be the best choice if you need a cutter for masonry, tile or stone, or if the workpiece exceeds the 25 mm cutting depth. Before choosing it, match the diameter, depth and chuck fit to the job rather than relying on the broad material list alone.