Lyndex NT05-016 Positive Drive Tap Collet, #1 System, 1/4" Tap Size, 1.18" Top Diameter, 0.75" Bottom Diameter
Lyndex positive drive tap collets - US Standard. Standard collets are used for standard and coolant-thru tap holders, maximum 750 psi. 1/4-inches tap size. #1 system. 0.255-inches tap shank. 0.191-inches drive square. 1.18-inches top diameter, 0.75-inches bottom diameter.