DIE 1/4X26 CEI BSC HSS

This is a 1/4 x 26 CEI die, cut in HSS (high speed steel), for chasing or cutting British Standard Cycle threads in that size. CEI/BSC threading shows up on a lot of the small fasteners and adjuster rods used throughout older British motorcycles, so a die like this is a shop tool rather than a bike part itself.