Groz Vee Block And Clamp 70X45X40Mm (Pair) Vee Blocks Cable Cutters 16770 Impact Universal Joint 3 4"Dr16770 16770 Impact Universal Joint 3 4"Dr16770 3 4"Dr Impact Universal Joint 106mm 01mm graduations Screw Thread Outside Micometer Anvils and spindle tips are interchangeable in matching pairs to enable measurement of Metric Unified or Whitworth threads Direct reading of screw pitch diameter (no need for calculation) Equipped with ratchet stop for constant measuring force Interchangeable anvils are optional and must be ordered separately Each pair of Vee Blocks comes complete with a pair of clamps Manufactured from fine quality steel these blocks are fully hardened and ground and are manufactured in numbered pairs