WEAVER QUAD-LOCK 1" X-HIGH RIFLESCOPE RINGS MATTE ARE MADE WITH EXTREMELY LIGHTWEIGHT ALL AIRCRAFT-GRADE ALUMINUM. ONE THUMBSCREW ON EACH OF THE TWO RINGS ATTACHES THE SCOPE TO YOUR RIFLE, EASY TO MOUNT AND REMOVE. EACH RING TIGHTLY FASTENS THE SCOPE WITH 2 STRAPS AND 4 SCREWS, WHICH MAXIMIZES RECOIL RESISTANCE.