Clamp for RLV silencers. Choose from three sizes: 1", 1 1/8" & 1 5/16". These sizes refer to the size of silencer you use. If you use a 1" silencer you need a 1" clamp. The ID of the clamp is actually larger so it can slip over the silencer. We are rotating in stainless steel clamps as the aluminum clamps go out of stock. You may get a stainless clamp depending on stock available.