1、Full CNC anode cutting, suitable for all kinds of weather, never rust. 2、Perfect fit for MTB Disc caliper brake adapter. 3、Light weight, high strength titanium bolts with many applications. These bolts + spacers set are great accessories for MTB Disc brake, crank and handlebar stem. Features: Full CNC anode cutting, suitable for all kinds of weather, never rust. Perfect fit for MTB Disc caliper brake adapter. Light weight, high strength titanium bolts with many applications. Specification: Material: TC4 Titanium alloy Color: Titanium / Gold / Rainbow (Optional) Size: M6×18mm / M6×20mm (Optional) Head Diameter: 10mm / 0.4in Head: #5 Torx Head Package Size: 5 * 5 * 2cm / 2 * 2 * 0.8in Package Weight: 30g / 1oz Package List: 4 * Bolt 4 * Spacer 4 * Bolt 4 * Spacer