formed on and protrudes coaxially from the rear surface of the supplementary lock 80 80 u2032 and engages the slot 541 of the core bracket 54 the key mount 82 82 u2032 is formed coaxially on the front surface of the supplementary lock 80 80 u2032 and is exposed through the supplementary lock hole 722 in the closed front end 72 of the cap 70 the key mount 82 is mounted in the fastening bracket 74 of the cap 70 the combination lock 60 is mounted in the inner housing 10 10 u2032 selectively connects to the outer housing 40 or disconnects from the outer housing 40 and has at least one combination assembly 61 and may be implemented with a latch panel 62 and a combination yoke 63 the at least one combination assembly 61 is rotatably mounted respectively in the at least one combination assembly recess 12 of the front surface of the inner housing 10 10 u2032 protrudes respectively through the wheel hole 721 in the closed front end 72 of the cap 70 and has at least one unique combination number and at least one combination notch 611 the combination notch 611 corresponds to the unique combination number with further reference to fig5 and 6 the latch panel 62 is mounted on the front surface of the inner housing 10 10 u2032 selectively connects to the outer housing 40 to lock the combination lock 60 selectively disconnects from the outer housing 40 to unlock the combination lock 60 and has a top an inner surface a locking protrusion 621 at least one wheel hole 622 at least one disconnect protrusion 623 and a central hole 624 and may have an elongated mounting hole 625 the locking protrusion 621.