This IRWIN T10758 Short Arm TORX Key Set contains a selection of keys manufactured from chrome vanadium steel for strength and durability. Heat-treated, so the metal resists rust and corrosion. With a routered tip finish for improved gripping and holding of screws. Supplied in a plastic holster that keeps hex keys together for easy storage. Sizes TX6, TX7, TX8, TX9, TX10, TX15, TX20, TX25, TX27, TX30 and TX40