QUALITY 100 MM DIAMETER BACK PLATES FOR HV4/ HV6 ROTARY TABLES TO MOUNT 3 JAWS SELF CENTERING ON THEM MADE OF TOOL STEEL. PRECISELY MACHINED. APPROPRIATE SIZE 3 X T NUTS + BOLTS ARE SUPPLIED ALONG. HAS A MT2 EXTENSION SPIGOT ON OTHER SIDE THAT SITS IN THE MT2 CENTER BORE OF THE ROTARY TABLE. RECESS 70 MM. 3 X 6 MM THREAD DRILLS. M6 SIZE COUNTERED BORED SO THAT T NUTS SITS INSIDE THEM PERFECTLY. PLATE IS DRILLED IN A MANNER THAT IT CAN FIT TO BOTH A 3 AS WELL AS 4 SLOT ROTARY TABLE.