The Craftsman MACH series platform is designed to get the job done with remarkable speed and efficiently for numerous DIY projects in the home or under the hood. The perfect tool when you need to fasten or loosen long fasteners in hard to reach places and do it quickly. This fastening tool has a sliding Aluminum collar with knurled handle. The handle has dipped rubber coating for added comfort. Bits can attach to the long shaft of the handle for added torque. The Mach T-Handle driver turns fasteners quickly and continuously with the free spinning collar. The strong square drive allows 3x more torque. The knurled collar can be locked into 3 different positions for maximum control. Craftsman unlimited warranty ensures durability and the ultimate in quality. Bits are not covered by the Craftsman warranty.