End of wood handle is bored and reinforced. Can be threaded onto tapered spindles so that small wheels, burs, etc. can be used on larger polishing motors. The chuck opens from .085" to .128" (2.2 to 3.3mm) so that 3/32" (2.4mm) and 1/8" (3.2mm) mandrels will fit. Overall length 3 1/2" (89 mm)