One-piece construction blends the ring and base into a single unit. Eliminating the ring/base joint not only keeps weight to a minimum, it provides a stronger mount. Each ring cap is 58" wide, with four, TORX screws, to keep large scopes from slipping or shifting. Designed by Mel Forbes of New Ultralight Arms. Mfg: Talley SPECS: 7000 series aluminum, black, anodized, matte finish. Accepts 1" dia. scopes, unless otherwise listed in fits column for 30mm dia. scopes. Height from bottom of ring to top of receiver: Low -.400" (10.1mm), Med -.500" (12.7mm). High -.640" (16.3mm), XHigh -.740" (18.8mm). Approx. we.