Check the listing for details. Wolf Tooth Components Rear 12mm Thru-Axle Button Slider- Black. Color: Black, Condition: New. Listed at 21.14 USD. Replacement rear axles that are lightweight, easy to use and look great. Button sliders are anodized caps for the non-drive side that stick out to prevent frame damage when laying the bike over. Available in several anodized colors. Trainer buttons attach to both ends of axle to allow fitment in trainers built around traditional QR end caps. Uses a captive steel washer under the head to reduce friction on the frame, transferring more of the tightening torque to clamping load for a stiffer interface as well as preventing sticking or galling when removed. Use a 6mm hex key for install and removal. See Wolftoothcomponents.com for full size measurement documentsItem Specifications: Size, 12mm, Color, Black, Model Name, Button Slider,.