This crank handle has an aluminum arm, and a brushed aluminum tapered handle that spins freely. A set screw holds the handle securely on all of Monster Mill's standard 3/8" drive shafts. Does not fit Monster mills with 1/2" shafts. Please note that you may need to widen one flat on your mill driveshaft when using the crank handle. The flats are designed for a drill chuck, rather than the handle setscrew. This is easily accomplished using a good metal file with the drive roller held firmly in your bench vice.