The Blue Spot Tools Impact TORX Bits are manufactured from S2 Steel for increased durability and strength. This set includes the most widely used spline sizes and are ideal for removing and applying TORX fittings. The bits are heat-treated hardened and tempered. They can be used with ratchets breaker bars and air tools. This 9 piece set inculdes the following sizes: T30 T40 T45 T47 T50 T55 T60 and T70.PTDB/S1498