Hejnar Photo Arca type 3.25 Inch Plate. Made in U.S.A 3.25 inch lens plate without ridge. 3.25 inches (82.5mm) long. 1.50 inches wide. 3/8 inches thick. Weight: 1.4 oz (41g) Precision C.N.C. machined from 6061-T6 Aluminium. Stainless steel hardware. Black hard coat anodized surface.