Specification: 1. Item 6506GUR-28-BKRFT 2. Diameter 65mm(2.7") 3. Cup 28mm 4. Grip Pin Stem 7/16"(11mm)width X 7/18"(22mm)length 5. Height 72mm 6. Width 53mm 7. Static Capacity 70KGS 8. Stem Grip Ring / Top Plate / Screw 9. Color Black / Grey / Red / Dark Grey / Green / Yellow / Blue / White