Unless mine was just defected, the design is horrible. The lock mechanism continually jams and will not align to open. After one use I spent 45 minutes trying to get it open again. After successfully doing so and using it four more times, I had to cut it to get access to my bike after spending more than an hour trying to get it to line up and unlock. Unfortunately I was away from home both times it jammed. Luckily the second time I was by Home Depot who graciously helped me or id be stuck. VERY disappointed and I also paid full price (I notice it’s not advertised about $10 less than I paid) I better be getting a refund from candian tire!