The Bahco S330 Socket Set contains sockets made from high performance alloy steel. With a Dynamic Drive™ profile to protect the sockets from wear and damage. Supplied in an oil and temperature resistant polypropylene case. Conforms to DIN 3120 / ISO 1174. Contains: 12 x 3/8in Hex Sockets: 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 & 22mm1 x 3/8in 60 Teeth Quick Release Ratchet2 x 3/8in Extension Bars: 75mm (3in) & 150mm (6in).1 x 3/8in Universal Joint1 x 3/8in x 1/4in Bit Holder 2 x 3/8in Spark Plug Sockets Hex: 16mm (5/8in) & 21mm (13/16in) 1 x 1/4in Spinner Handle, 2-Component Handle 1 x 1/4in x 1/4in Bit Holder 3 x 1/4in Slotted Bits: 4, 5.5 & 7mm4 x 1/4in Phillips Bits: PH1, PH2, PH3 & PH46 x 1/4in Hex Bits: 3, 4, 5, 6, 7 & 8mmAdditional Information:• Metric/Imperial: Metric• Set Type: 3/8in