Size: 1.75" Tube DiameterBillet machined bar mounts make it easy to mount intercoms, headset hangers, and other accessories to 1.75" diameter tubing. 1.75" Tube Diameter Half-Clamp Design Stainless Steel Hardware CNC machined alloy Black anodized finish A hole in the bottom of mount accepts an 8-32 screw. The screw is not included.