Introducing the Astro Tool 94409TS 9-Piece 3/8" Drive Nano Impact Triple Square Bit Sockets. Like our popular Torx and Hex bit sockets, these are extra low profile at 1-1/8" long, designed 26% shorter than others allowing for more access, direct transfer of impacts and increased durability Just add an extension for longer reach. These sockets are lifetime **forged from S2 alloy uniquely treated to provide superior resistance to twisting and chipping compared to CR-V, CR-MO and even other S2 sets. Larger sizes feature tamper proof design. This set includes the following: one aluminum socket holder rail and impact bit sockets in sizes M4, M5, M6, M8, M10, M12, MT14, MT16, MT18.