The GMP Tools Thumb Nut (part 28882, Millennium part 536074) is a hand-tighten fastener used two per assembly on GMP cable blower equipment, letting techs secure or release components in the field without tools. It's a common wear item to keep on the truck since a lost or stripped thumb nut can stall an install on a jetting job. Sold to match the required quantity of two, it's an easy add to a parts kit. Order it with matching pins, thumb nut caps and drive belt assemblies for the same GMP blower model.