GSG Mototechnik Front and Rear Axle Sliders are designed to protect your bike from costly damage in an accident. Delrin sliders mount through the front and rear axle of your bike with a stainless steel rod. Installation is fast and easy. Manufactured in Germany. Note: There are different Allen wrench sizes on the front axle 10/17 mm or 14/17 mm. When ordering, be sure to include the width across flats