Metal Wall Bracket for Mats Storing mats has never been easier. Our simple aesthetic mat rack has a wooden back plate and chrome holding prongs. The prongs are 400mm apart and 8mm in diameter. Each rack comes with a fitting kit. Each mat rack holds 20 x 9mm Supasoft Mats, 13 x 14mm Supasoft Mats, 12 x 9.5mm Vinyl Aerobic Mats. Max weight will hold 20kg.