THESE ARE SIEMENS ECQL1 (SINGLE PIECE) CIRCUIT BREAKER LOCKS TO KEEP IMPORTANT CIRCUITS ( LIKE ALARM, OR SUMP PUMP) CIRCUITS FROM INADVERTENTLY BEING TURNED OFF. THEY WILL NOT STOP THE BREAKER FROM TRIPPING JUST MAKE SOMEONE THINK TWICE ( AND BRING A SMALL SCREWDRIVER BEFORE TURNING OFF A PROTECTED BREAKER ) THEY ARE GREAT FOR PROTECTING ALARM CIRCUITS OR SUMP PUMP CIRCUITS OR ANY OTHER BREAKER YOU DON'T WANT ACCIDENTALLY TURNED OFF. THEY FIT MOST ITE / SIEMENS AND MURRAY BREAKERS, BRYANT, GE, CUTLER HAMMER BR ( not tan handles) T B, CHALLENGER HOME LINE BREAKERS (std ones not Sq D) ABOUT THE ONLY BRAND OF STANDARD BREAKER THEY DON'T FIT IS THE FEDERAL PACIFIC STAB LOC'S AND SQUARE D QO. IF YOU WANT TO KNOW IF THEY FIT A PARTICULAR BREAKER MESSAGE ME AND I WILL TRY AND CHECK IT OUT. THIS LISTING IS FOR 1 INDIVIDUAL BREAKER LOCK. SHIPPING OF 4.50 IS JUST FOR THE FIRST ONE ( it is the most expensive one to ship!!) Sorry talk to the Post Office!! AND THEN THE SHIPPING IS .20 FOR EACH ADDITIONAL ONE. SOME OF THE PICTURES ARE OF THE NARROWER TANG VERSION ECBX231M, AT TIMES IF I AM OUT OF THE ECQL1 IT MAY BECOME NECESSARY TO SUBSTITUTE THE ECBX231M'S, IT IS THE ONE ON THE SMALL HANDLE BREAKERS/ TWINS. THE ONLY DIFFERANCE IS THE TANG IS NARROWER.