The 1.125” square backer plates are .125” thick for strength and durability, yet light-weight. Its domed profile provides greater effective stud height, and offered in 7mm and 5/16” (use 7mm for ¼” studs) to cover all applications. Available in rich, long-lasting anodized colors in 5/16” size only - purple, red, blue, and green - Also available in .090” thick, high strength, heat treated steel.