One piece 5 point Tamper Proof Torx Plus 55IPR 140mm 5-1/2" Long Bit socket Tamper proof with center hole. Bits are made of S2 steel for maximum durability. Sockets are made of satin finished Chrome Vanadium steel with 1/2" (12.7mm) square drive Bits are impact ready. Suitable for both hand tool and electric tool | Industrial quality for auto repair and air tools. US-BASED CUSTOMER SERVICE: Available by chat, email, phone, or visit us at our customer service center in La Crosse, WI.