Designed for Camoplast single ply tracks as well as the Ski Doo XP / XS chassis with single ply tracks "Track Trapping" design features a 60 carbide tip for aggressive penetration Chamfered head design reduces vibration and idler wheel wear Use only with Power Plate Plus and Super-Lite Plus Series Backers PRO SERIES available in 1.375" - 1.875", they come without nuts; these are the best recommendation for Super-Lite Pro Series Backers