This Teng Tools Impact Driver Set contains a 1/2in Drive Impact Driver, a Coupler Adaptor, 5/16in Hex to 3/8in Male Hex Adaptor and 17 Bits.Supplied in a case with a removable, hinged, click lock lid for use as an individual set or as part of Teng Tools tool storage systems. Dimensions: 265 x 142 x 50mm. Contents: 1 x 1/2in Drive Reversible Impact Driver.1 x 1/2in Drive Coupler Adaptor.1 x 5/16in Hex to 3/8in Male Adaptor.4 x 5/16in Drive Slotted 36mm Hex Bits: 6mm, 8mm, 10mm and 12mm.4 x 5/16in Drive Phillips Bits: PH1, PH2, PH3 and PH4.4 x 5/16in Drive Hex Bits: 4mm, 5mm, 6mm and 8mm.5 x 5/16in Drive TORX Bits: TX30, TX40, TX45, TX50 and TX55.