Using the Helo 6mm Square Head Axle Upgrade Kit means you won't have to deal with stripped out or never staying tight axles again. Works with any standard 4mm Allen Wrench bit/driver Fits most brands and models using square head 6mm axles Interior fastening system for added strength and reduced loosening Nickel plated steel for strength and durability Pre-treated with Helo Bolt Glue on screw threads Please note that with some skate / chassis models the axle with the square end may be a tight fit initially upon installation. Hand tighten fully with a bit of torque to get the square end to pull into the chassis. After having done this a few times, the square head should go in and come out without much effort. These fit Marsblade R1 Frames GREAT, a much better axle than the stock R1 axles that can strip fairly easily.
