‎•Uses standard 5-C type collets up to 1–1/16″ diameter to hold round, hexagonal and square workpieces •Can also be used with step chuck collets and expanding chucks for internal gripping •Double acting, piston type air cylinder develops holding power 18 times air line pressure •Maximum operating pressure 150 psi •Has 1–7/64″ hole completely through unit for bar feeds or dropping finished parts •Base of fixture is relieved for chip removal and coolant flow.