Product Name : Emergency Stop Push Button Switch; Button Diameter : 40mm / 1.6inch; Mounting Hole Diameter : 22mm / 7/8inch; Adaptable Panel Thickness (Adjustable) : 6mm / 15/64inch (Max) Button Size (Approx. ) : 39 x 29 x 73mm / 1.5inch x 1.1inch x 2.9inch (L * W * H);. Package Content : 2 x Emergency Stop Button Switch.