For setting, reaming, tapping, etc. Swivel wood handle is ball shaped and fits comfortably in the palm of the hand. Overall length is 3 1/2". Fingertip control is achieved by placing the ball handle in the palm of one hand while turning the tool's shank with your fingers. Has two removable collets with a combined chucking capacity from 0 to 3/32" (2.35 mm).