Usage Tips:1、Effective Protection: Push the button in the cover, resuce wearing and tearing, make the switch longer life. 2、Excellent Workmanship: Sturdy and durable, not easy to age, bend resistant, corrosion resistant. 3、Easily Use: When you don't need to lock it, you can keep the base on site without affecting the operation at all. 4、Easily Install: Just install the base on the bottom of the emergency stop switch and it can be locked and removed at will. 5、Applicable Scenarios: Suitable for industrial, chemical, electric power, petroleum, coal, flammable and explosive places. 10 x Emergency Button Switch Cover Item Type: Emergency Button Switch CoverMaterial: PCModel: BS-01Purpose: For Installing on the Control Button to Prevent Accidental TouchInner Diameter of Mounting Hole: Approx. 22mm / 0.9in