SC. The Borg BL2000 series is a range of fully mechanical pushbutton coded locks. The BL2021 features a back to back keypad to provide keyless entry to authorised code holders only. With its ergonomic design and attractive finish, as well as having components treated for strength and durability, the BL2021 provides a stylish and strong security solution.. Back to back keypads. Non handed. 60mm backset latch. Non holdback