These are excellant lightweight tactical mounts and are designed for picatinni- style rails. The mounts are one inch long and has three screws on each side to hold the scope in place. The cross bolt had a 1/2" hex head nut to tighten. The recommended torque on the top rings is 20 in/lbs and you use a T15 driver. The cross bolt is torqued to 65 to 100 in/lbs and has a 1/2" hex head. They will not mare up your scope like steel rings can do. They are very reasonable priced compared to other mounts. A great value.
This review was written in the old system and had content requirements that are different than reviews written today.