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ConcentricKO-Copyright-IMG_1200-800×600

Concentric knockouts (KO's) ready for removal.

Adjustable pliers squeeze the punched in knockout ring. The pliers are rocked forth and back until the KO is loose.

Inside of an outdoor circuit breaker load center panel with two knockouts punched in a little.
Cutting the punched out knockout ring using BX cutting pliers.