Features: Variable Speed Reverse Provides Controlled Drilling & Driving In A Variety Of Materials. 6-position Clutch Prevents Screws From Stripping. Built-in Accessory Bit Storage For Easy Access To A Variety Of 1" Bits. Spring Loaded Battery Allows For Easy Installation & Removal Of Batteries. Stud Finder Detects Studs Through Walls Up To.75" Thick.