The MIP Nut Driver Speed Tip Wrench is a 4.0mm hex nut driver bit designed for use with a power drill or impact driver. The speed tip shank fits standard 1/4-inch hex chucks, allowing faster fastener driving compared to a hand-held nut driver. It is a purpose-built hobby tool suited for working on RC vehicles that use 4.0mm hex nuts. Features: 4.0mm hex drive size Speed tip shank fits standard 1/4-inch hex chuck Compatible with power drills and impact drivers MIP brand hobby tool 7/7/26 cs