A 1 Insert holder B 1 Hardened steel pin for grooves, centering shoulders, blind bores etc., tilted through 8° C 1 Hardened steel pin, cylindrical for depth measurement. Measuring inserts with hardened steel ball tip D 1 Insert with a .035 in / 0.9 mm dia. E 1 Insert with a .075 in / 1.9 mm dia. F 1 Insert with a .115 in / 2.9 mm dia. G 1 Measuring insert with a cone-shaped steel measuring face, hardened, .315 in / 8 mm dia. Extensions, .788 in / 20 mm long 1 Threaded extension M3 to M3 1 Threaded extension M3 to M2.5