Uses 6mm allen key to tighten. 178 mm M12 x 1.5mm thread pitch. Our Lightning Bolt-On thru axles offer the highest quality, simple, lightweight alternative to that bulky handle. Available in a range of sizes that fit both front and rear wheels on all types of thru-axle equipped bikes. Lightning is Better. Our front and rear Lightning Bolt-On axles offer a stronger, more durable, lower profile and lighter weight option to replace your stock thru-axles. Low Profile. No more bulky handles to strike trail obstacles. Aerodynamic design. Light Weight. Our axles are internally bored to remove unnecessary material without compromising strength. Easy to install. Our matching front and rear Lightning Bolt-On Axles only require a standard 6 mm hex wrench for easy installation and removal. Better Tolerances. Manufactured in the USA to the tightest tolerances using aerospace materials and CNC manufacturing. No longer will your axle loosen while riding. SPECIFICATION The diameter of this axle is 12 mm and the true length of the axle shaft is 178 mm. Please note: Thru-axle lengths do not equal hub standards. An axle has to be longer than the hub to fit in the frame. A 12×148 hub does not equal a 148 mm long axle. This axle has a 1.5 mm thread pitch. Weight: 42 grams The axle is precision CNC machined in the USA from 7075 aluminum and hard anodized for rugged durability. Our axles are 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. Designed, built and quality tested in the USA. Proven around the world.