SHOCKWAVE™ IMPACT DUTY steel (Chrome-Molybdenum) is high quality alloy steel which provides ultimate strength and durability. I have only used a couple of these bits so far but have been happy with the performance and quality of those i have used. One-piece design HEX bit and socket with 1/2" internal square drive reception according to DIN 3121 / ISO 1174-2. li class="ml-20">* Excludes some Online Exclusive lines - Items sent directly from the supplier (some Online Exclusive lines and Car Parts) can take up to 10 working days. p>Late or missing payments may have serious consequences for you and cause you serious money problems.p>Halfords Autocentres Ltd is authorised and regulated by the Financial Conduct Authority (FRN 755309) and acts as a credit intermediary and not a lender, offering credit products provided by a limited number of finance providers, including Payment Assist. The Halfords Advanced 8 Piece Impact Torx Set 1/2" Drive includes a set of impact sockets that have been designed to withstand the high torque of impact wrenches.