Model 1 Model 2 Item: Medium SCTM-55 | Item: High SCTM-38 Diameter: 30mm Height (bottom to ring center): Medium 32mm / 1.25" | High 38mm / 1.5" Weight (net): Medium 115g (4.0oz) | High 130g (4.6oz) Finish: black matte Material: 6061-T6 aluminum alloy Mount: 11-12mm dovetail Unique construction provides strength well Six torx screws per ring will hold your scope under any conceivable situations Perfect Alignment and Superior Accuracy Clamps in black matte and dark grey anodizing finish Fittings include: Hex key Item: Medium XASR-3005 | Item: High XASR-3006 Diameter: 30mm Height (bottom to ring center):Medium 32mm / 1.25" | High 38mm / 1.5 Weight (net): Medium 125g (4.4oz) | High 140g (4.9oz) Finish: Black matte Material: 6061-T6 Mount: 11mm dovetail Unique construction provides strength well with steel cross-bolt Six torx screws per ring will hold your scope under any conceivable situations Perfect alignment and superior accuracy Do not use over 18in of torque on the scope rings Fittings include: Hex key