Product Name: Cosmetic Nut Knurling Type; Product Number: EPN-M30RC; Material: Brass; Size: Seat Diameter (A): 1.2 inches (30 mm); Seat Thickness (B): 0.4 inches (10 mm); Screw Diameter M6 x P1.0 ; Surface: Chrome Plating; Accessories: Accessories not included with this product