Grip Screw O rings These O rings will act like a lock washer to keep your grip screws tight. Sold in a package of 4. These are placed over the threads of the grip screw below the head and compress between the head of the screw and the bushing. Due to the location of these O rings, they do not raise the head of the grip screw. These work with both standard and slim grip screws and bushings. Also works on Taurus PT1911 grips.