Black Anodized Aluminum M8/M10/1-4 inch/1-4inch Long Bolt Mount - Made by Premium CNC Aluminum - 25.4mm ball with Lagging, more secure lock - Anti-theft Doulbe Socket Arm compatiable, all angle support. - 1/4 inch Screw Length 6mm , 1/4 inch Long Screw Length 23mm. - Compaitable with most Cycle Steam Mount Hole - Fits Diameter: M8/M10/1-4 inc