Feature Heavy Duty, 30mm Diameter, 25.4mm 1" Center Height Low Profile 6 Torx Screws Per Ring, Extremely Accurate w/ Full CNC Machined, 1913 Picatinny Specification Diameter: 30mm Height:25.4mm 1" from bottom to ring center Ring Width:26mm 1" Weight (net):135g / 4.8oz Finish:Black matte Material:6061-T6 Mount:1913 picatinny 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 18 inch / pounds of torque on the scope rings&'; screws Fittings include: Hex key Suggest 25 inch / pounds (can accept max 45 inch / pounds) torque force for big nut when installing the mount on the picatinny rail Relations 30mm X-Accu 1" Medium Profile Picatinny Scope Rings 30mm X-Accu 1" Medium Profile Picatinny Scope Rings