Ring rubber cushion for 1/4 inch - 20 thread cameras and accessories. (For 1/4-inch threaded models only).
Keep it tight: Metal-to-metal connection that keeps slipping/cannot be loosened? Rubber washer with non-slip design on both sides solves the problem perfectly.
Prevent scratches: they help protect your camera and accessories from metal brackets that can scratch your camera monitor/light, etc.