Size: 75mm*17mm(3",3/4") Material: tough stainless steel. Magnet: diameter 40mm*1pc, 1000-1200gauss. 4pcs Magnetic Part & Tool Tray SetSize: diameter 75mm(3''), Depth: 17mm(3/4'')Material: tough stainless steel(430/0.4mm)Magnet: diameter 40mm(1-1/2'')×1pc 1000-1200gauss PVC bottom prevent from being scratched.. 4pcs Magnetic Part & Tool Tray Set