1 N.O. Contact Block, 30.5 mm, 600V Rated, Base Mount, Non-metallic, Standard Heavy-Duty, HT800 Series, Terminal Type: posidrive saddle clamp. Eaton's HT800 series features a wide variety of devices, including momentary, illuminated and mushroom head pushbuttons, selector switches, indicating lights and push-pull switches. They are corrosion resistant and water- and oil-tight devices that are suitable for industrial applications, including replacement of other manufacturer's 30.5 mm pushbutton devices. This listing is for Each.