Master Lock Grip Tight™ Circuit Breaker Lockout not only have a narrow profile for side-by-side lock out, but they also have a secure and simple mounting for a solid lock out. The body is made from hardened steel. The circuit breaker has a narrow profile for side-by-side lockout, and fits all types of breaker toggle. Secure and simple mounting for solid lockout, it has a durable construction with powder-coated steel and reinforced polymner so stands up in harsh environments.Master Lock Grip Tight™ circuit breaker lockouts not only have a narrow profile for side-by-side lock out, they also have a secure and simple mounting for a solid lock out. The body is made from hardened steel. The Lockout Griptight Set comprisess: MLK491B, suitable for wide and tall breaker toggles. MLK493B, suitable for standard breaker toggles.