Helps to properly lockout valve wheels from 1" up to 14" dia. Designed with (2) flattened half-moons that completely cover valve wheel. Made from polypropylene plastic. Fully dielectric and resistant to extreme temperature changes (-50° F to 360° F). Resistant to cracking and abrasion. Meets OSHA 29 CRF 1910.147 and 1910.269 regulations and ANSI Z353.1. Red.