The MEGALOK driver features a 1/4a ^2 quick change chuck that locks the bit into the driver! In addition to the 7 double end bits that come with the handle, the locking quick change chuck accepts all 1/4a ^2 hex-shank power groove accessories like extensions, nut drivers, socket adapters, and other accessories. The specialty made handle is durable and drop resistant. Don't just take our word for it, the Megalok Screwdriver is proudly made in the USA and comes with a lifetime warranty! Specifications: Weight: .5 lbs Driver Features: Retractable Bit Cartridge, Locking Bit, Palm Saver Cap Screwdriver Bits: Square, Phillips, 1/4a ^2 Hex Shaft, Flat, Torx Warranty: Lifetime Warranty Made in: USA