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