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. Ref: UTTK4111