They are secured on your rail using two side tension screws that apply pressure to two locking tabs we throw in an allen wrench with every order. There is absolutely no metal to metal contact, this prevents heat transference and damage to the rail. They measure 1 3/8" x 2 3/4" 35mm x 70mm and weigh about 20 grams that’s about as much as four nickels. Proudly made in the U.S.A.
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