Machined from 6061T6. Stainless fasteners with Neoprene gripper ring. Clamps are modified Cateye model clamps, the very best in the organization for toughness and array of measurements. 8mm). This addresses virtually every one of the sizes of tubes you should attach to. If you'd like to attach to some rack https://carderr814cbf0.hamachiwiki.com/user