These Accu-Lite 30 mm Low mount rings by Element Optics will fit to any Weaver or Picatinny rail. They’ve been machined out of 7075-T6 aluminium, and the crossbolt, base clamp and nut are made of stainless steel, these materials make for a reliable and high quality product which will last a long time. Element Optics has made sure that the Accu-Lite 30 mm Low Weaver/Picatinny mount has been machined very precisely, which provides for a tight fit and a secure bond between your rifle and rifle scope, preventing unwanted alterations and guaranteeing excellent performances. Precision CNC Machined from aircraft-grade 7075-T6 Aluminum & Stainless Steel Built to handle high torque specs without failing Universal Base Nut can be used with Metric & Imperial wrenches Fits both Weaver and Picatinny rails Rounded finish prevents snagging on bags, vegetation & obstacles MODEL 30mm L 30mm M 30mm H HEIGHT 22mm (0.87”) 25mm (0.98”) 29mm (1.14”) WEIGHT (PAIR) 113g (4.0oz) 123g (4.3oz) 137g (4.8oz) MATERIAL 7075-T6 ALUMINUM & STAINLESS STEEL MOUNTS TO PICATINNY WEAVER TOOLS REQUIRED 13mm OR 1/2” SOCKET/SPANNER, T15 TORX MAX TORQUE (RINGS) 25 IN-LBS (2.8NM) MAX TORQUE (BASE) 68 IN-LBS (7.7NM)