Leupold RM CZ 527 30mm Medium MatteUse as a high-quality alternative to ringmounts sold by firearms manufacturers and as a no-tap mounting method for most .22 rimfire rifles with an 11mm, 13mm, or 3/8" dovetail rail. Superior integrity and tighter tolerances because we machine them from solid stock.Ring Diameter (in): 1,00Height (in): 1,18Ring Diameter (mm):30.00