After years of mountain biking with thru-axles with bulky handles that seemed to strike every trailside obstacle, Robert Axle needed a better option Lightning Bolt-On thru axles offer the highest quality, simple, lightweight alternative to that bulky QR handle Available in a range of sizes for all types of thru-axle equipped bikes The axle is precision CNC machined in the USA from 7075 aluminum and hard anodized for rugged durability Built to the tightest standards in the industry No special tools required. Design allows for installation or wheel removal using your standard 6mm hex wrench Compatible with Hexlox security systems Color: Black