Brady 66321 Circuit Breaker Lockout Clamp On, For 120 277V AC Volt, For Multipole Circuit Breaker Type 52JR70 Durable full extension ball bearings Durable full extension ball bearings Resolution: 1 or 10 RPM depending upon range 147 (C) (4) (ii) (A) (1) (c) (5) (ii) (C) (1) OSHA Compliant Yes Lockout Type Tie Bar Circuit Breaker Voltage 120 277 For Voltage 120 277V AC Circuit Breaker Lockout Type Clamp On Minimum Temperature 4 Degrees F Features Isolates and Secures Circuit Breaker Switches Maximum Temperature 248 Degrees F For Circuit Breaker Type Multipole Resistance Properties Chemical Resistant Mount Type Tie Bar Circuit Breaker Lockout