The Cooper Tools 12LF Series and 10LF Series Dotco die grinders feature an increase from 0.3 hp to 0.4 hp and a new design that does not require a shim kit after disassembly. The die grinders are available with rated speeds of 12,000 rpm or 20,000 rpm using either 9 cfm or 11 cfm of air at 90 psi. The 10LF Series has a rugged aluminum body for maximum durability, while the 12LF Series features a dual-material composite body with cushioned areas for maximum comfort and control.