Baby got back. No, we're not talking a killer ba-donk-a-donk; we're talking stud backers. Premium, heat-treated aluminum stud backers. We made these 1-3/8" round to resist tearing. These backers are 0.140" thick, and 1/4" tall, the perfect weight and profile to secure any 5/16" diameter stud. The premium aluminum construction resists wear, tear and corrosion, and of course, we've got your back with a two-year replacement warranty. Made in the USA.