3", Impact Ready Locking Bit Holder, Locking Mechanism For Accessory Retention, Magnetism For Fastener Retention, Accepts 1" Screwdriving Bits & All 1/4" Hex Shank Accessories For Drilling & Driving, Slim Profile For Fastening & Drilling In Tight Spaces, Engineered For Use In Impact Drivers, Applications Includes Wood & Metal.