The Master Lock ball valve lockout kit includes two ball valve lockouts, one that clamps onto a valve handle, and one that locks out a removed valve handle, to provide the ability to use a padlock (sold separately) to help protect against operation of 1/4" to 4" (.6 cm to 10.1 cm) sized ball valves during maintenance and repair. This kit is part of a lockout/tagout (LOTO) safety procedure required at facilities where electrical plugs need to be isolated during maintenance and repair.. Lockout/tagout (LOTO) safety procedures require that lockout devices meet Occupational Safety and Health Administration (OSHA) 1910.147(c)(5) standards for quality assurance. LOTO devices use color, warning labels or tags, and sometimes a physical barrier to help prevent machine operation or power activation during maintenance and repair. Master Lock manufactures padlocks, combination locks, and related security products. The company, founded in 1921, is headquartered in Milwaukee, WI. What"s in the Box? Wall-mounted bracket 468L "handle-off" ball valve lockout S3068 "handle-on" ball valve lockout