12A, Sawzall Reciprocating Saw, Powerful Motor Delivers 0-3,000 SPM For High Performance Cutting In A Variety Of Materials, 1-1/8" Stroke Provides Maximum Cutting Speed, Gear Protecting Clutch Extends Gear & Motor Life By Absorbing High Impact Forces Caused By Blade Lock Ups, Counter Weighted Mechanism Provides Reduced Vibration For Smother Operation, Quik Lok Blade Clamp Provides Fast Tool Free Blade Changes.