It is fully CNC machined and made out of 6061 T6 Billet Aluminum. The clamp is then anodized and engraved. 31.8mm (1-1/4") with No Shim 30mm (1-3/16") with Provided Shim 6061 T6 Aluminum Full CNC Stainless Steel Bolt and Custom Shield Fastener Anodized in Multiple Color Options Laser Engraved Chart below is for reference only and is not 100% correct on every application.
