Introducing the squire hammerhead d lock with mounting bracket this big lock will deter even the most experienced of bike thieves if you are seeking a high security lock then look no further the hammerhead has your back this d lock is a key functioning lock and does come provided with two keys and has an extra secure double locking method for extra security you are able to get extra keys cut if needs be however there is a specific key card you need in order to get them cut the head of the l