Specifically configured for service technicians in the Electronics industry. The shaft opening serves as a 1/4a ^2 hex driver. Loaded with 7 double end professional quality bits, this assortment of bit types and sizes provides the 14 most popular tips for driving screws. The shaft opening serves as a 1/4a ^2 hex driver! Hence the name "15-in-1a ^2. Specifications: Weight: .5 lbs Driver Features: Palm Saver Cap, Retractable Bit Cartridge, EZ Guide Collar Screwdriver Bits: Flat, Square, Phillips, 1/4a ^2 Hex Shaft, Torx-Pin, Spanner Warranty: Lifetime Warranty Made in: USA