Match A Thread from Roller Clutch Tools LLC includes both standard and metric gauge hardware. The organization system has reversible boards with bolts on the front and nuts on the back to keep shops organized. Each board includes a magnet and ruler as well as a durable, compact design with metal stand. The product is made with heavy duty, color-coded nylon. Blue accommodates 30 bolt/nut standard sizes from #3-48 to 3/4”-16”. Red accommodates 19 bolt/nut metric sizes from 2mm to 16mm.