Bosch GBM9-16 9 Amp Drill/Mixer with 5/8-Inch Keyed Chuck

When a project calls for both material mixing and drilling, a tool with adjustable speed and a secure grip can make the work easier to manage. The Bosch GBM9-16 combines a 9 amp motor with variable speed for mixing materials such as paint, plaster, mortar and epoxy resin.

Could one tool handle both mixing and drilling tasks? The GBM9-16 also offers forward and reverse operation for drilling in wood or metal, making it a practical choice for jobs that move between applications.

Its rotating D-handle gives you a choice of hand position, while the 5/8-inch keyed chuck accepts a range of drilling and mixing accessories.

Why it makes sense

For mixing, the variable-speed control lets you match the pace to the material. Higher speeds suit lower-viscosity products such as paint and sealing compounds, lower-speed, higher-torque operation is intended for mortar and epoxy resin. That control helps make this drill/mixer useful across different stages of a renovation or finishing job, rather than limiting it to one kind of mix.

The 360-degree D-handle can be positioned to suit the task and your preferred hold. A two-finger trigger with a lock-on button supports sustained mixing, while a removable auxiliary handle provides another grip option. For a worksite task that alternates between mixing and drilling, this combined approach keeps both functions in one tool.

Highlights

The 9 amp motor, all-ball-bearing construction and precision-cut steel gears are designed for high-torque mixing work. Variable speed and forward/reverse operation cover mixing as well as drilling applications, with a no-load speed range of 0–700 RPM. The heavy-duty 5/8-inch keyed chuck supports a broad selection of compatible accessories. A magnesium front housing helps keep the housing lightweight while providing a durable construction.

Buyers often praise the tool’s power and its ability to mix drywall compound, alongside positive comments about its build. Experiences with durability are mixed, so these reports are best treated as individual impressions rather than a promise of service life.

Getting the most from it

Choose the speed to suit the material: use a higher setting for thinner mixes such as paint, and a lower, higher-torque setting for mortar or epoxy resin. For drilling, the forward and reverse functions support work in wood or metal. The maximum hole diameters listed are 2-1/2 inches with a steel hole saw, 1/2 inch with a steel twist drill bit and 1 inch with a wood auger bit.

The package includes the GBM9-16, an auxiliary handle and a chuck key. Fit the accessory suited to the task and secure it in the keyed chuck before use. The tool is specified for a 120-volt power source.

Questions before you buy

What materials can it mix? It is described for materials including paint, plaster, mortar, epoxy resin and sealing compounds. The variable-speed motor lets you choose a faster pace for lower-viscosity materials or lower-speed, higher-torque mixing for mortar and epoxy resin.

Can it be used for drilling as well as mixing? Yes. It has forward and reverse operation for drilling in wood or metal, with a no-load speed range of 0–700 RPM. The listed maximum hole diameters depend on the type of bit used.

Can the D-handle be repositioned? Yes. The D-handle rotates 360 degrees so you can set its position for the task. A removable auxiliary handle provides an additional grip option.

Is it worth it?

The Bosch GBM9-16 suits renovation and trade tasks where controlled mixing and occasional drilling are both part of the job. Its 9 amp motor, adjustable speed, 360-degree D-handle and keyed chuck make it a versatile fit for working with varied materials and accessories.