Professional tool for commercial or occasional use Stubby impact Metric Hex Allen Keys Metric size Allen key sockets Stubby Impact Hex bit sockets 1/4" and 3/8" drive hex sockets SET INCLUDES THE FOLLOWING SIZES - 1/4" Drive Hex Bits - 6mm / 7mm / 8mm and 10mm - 3/8" Drive Hex Bits - 12mm / 14mm / 17mm / 18mm and 19mm Manufactured from chrome molybdenum steel for strength and durability 1/4" and 3/8" drive so will fit any 1/4" and 3/8" drive ratchets / power bars Comes on a socket rail for easy storage and transportation Stubby Hex Allen bits for access into restricted areas.