SPECS: Machined aluminum, hardcoat anodized, matte black. SAR-1 – 1.75” (4.5cm) long rail. 1.1 oz. (31g) weight. Fits 1” scope tubes. SAR-3P – 1.56” (4cm) long rail. 1.1 oz. weight. Fits 30mm scope tubes. SAR-3PS – 1.56” long rail. .6 oz. (18g) weight. Fits 30mm scope tubes. SAR-4 – 1.75” long rail. 1.2 oz. (34g) weight. Fits 34mm scope tubes.