PERFORMANCE STAR STUDS billet aluminum backers for single and 2 ply tracks now available. These are super light and combine the backer and nut in one unit. The machined groove enhances traction while also engaging the installation wrench. These are top quality and offer superior performance and traction while being stronger than any nylon backer on the market. Sold in 48 packs- free installation wrench with purchase of 2 packs. This part number is for single ply tracks.