Flex Zero bases locate and clamp workpieces, fixture plates and vises for 5-axis machining with no tool interference. 4-point clamping in a single operation shortens time during fixture change operations. Used with CP185 clamping pins (sold separately) that are fully clamped to base in approximately three rotations of the single clamping key. Locating repeatability is .005 mm. The body is made from 1050 nitrocarburized steel, HV 400. The threaded spindle is made from 4140 steel with a black oxide finish.