80 mm Diameter Back Plates For HV4/ HV6 Rotary Tables To Mount Chucks On Them Made Of Tool Steel. Precisely Machined. Supplied With 3 X T Nuts + Bolts As Per Back Plate 's Size. Has A MT2 Extension Spigot On Other Side That Sits In The MT2 Center Bore Of The Rotary Table. Recess 55 Mm. 3 X 6 Mm Thread Drills. M6 Size Countered Bored So That T Nuts Sits Inside Them Perfectly. 3 X M6 Counter Bored. Plate Is Drilled In A Manner That It Can Fit To Both A 3 As Well As 4 Slot Rotary Table.