The MEGAPRO Original 15-in-1 Screwdriver has industrial-grade torx, square, hex, slotted and phillips screwdriver bit sizes combined into one. This all-purpose multi-bit screwdriver is our most popular seller. 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: Torx, Square, Phillips, 1/4a ^2 Hex Shaft, Flat Warranty: Torx, Square, Phillips, 1/4a ^2 Hex Shaft, Flat Made in:USA