1、2 Holes Design: There are 2 holes on the control station box, which can perfectly match with push button for easier operation. 2、Better Control: Can be used for the remote control of AC contactors, electromagnetic starters, relays and so on, very practical. 3、Practical Uses: Allows for application on ship, textile field, printing equipment, automation, crane, instrumentation and more. 4、Great Material: The switch button case is made from premium ABS and PC materials,so it's waterproof and durable for long use. 5、Easy to Install: Comes with a light weight and a compact size, the control casing enables convenient installation and working. Item Type: Push Button Box Material: ABS, PC Overall Product Size: Approx. 130 x 71 x 67mm / 5.12 x 2.8 x 2.64in Centre Hole Aperture: Approx. 22.5mm / 0.89in, 2pcs. Side Hole Aperture: Approx. 21.8mm / 0.86in, 2pcs. Bottom Hole Diameter: Approx. 19mm / 0.75in, 2pcs. Mounting Hole Aperture: Approx. 4.8mm / 0.19in, 4pcs. 2 x Push Button Box Cover 2 x Push Button Box Base 8 x Screw