The Blue Spot Tools 9 PCE 1/2" Impact Hex Bits (6-19mm) are manufactured from S2 Steel for increased durability and strength. The set includes the most widely used hex sizes and are ideal for removing and applying hex fittings. The bits are heat-treated, hardened and tempered. Manufactured from S2 Steel for increased durability Heat-treated, hardened and tempered Can be used with ratchets, breaker bars and air tools Hex 1/2" Drive.