Important Warnings - Drills 1. Remove the chuck key before drill starts. 2. High reaction torque can be developed in the case of stalling, which can be caused by excessive loads being applied to the drill bit, by the drill bit snagging on the material being drilled into or by the drill bit breaking through the material being drilled. 3. In cases where the means to absorb the reaction torque are requested, it is recommended to use a suspension arm whenever possible.