Bremmy Spotter ArmsThe Bremmy Spotter arms are used to keep you safe while lifting inside your squat rack. These spotters use a side pin and have holes in the front and back that are made to utilize magpins hitchpins. The 1 4 bent side plate design has 1 holes on a 2 pattern. The center tube is 2. 5 square tubing that combines with the 1 4 plates to accommodate certain attachments that are made for 3x3 tubing. They have a stainless steel pin and stainless steel hardware