SBL320 SC 60mm BS. The Securefast SBL320 Easy Code with Holdback function are designed to offer a simple & convenient solution to provide security for low to medium traffic areas such as store rooms, workshops & offices. This mechanical digital lock incorporates 13 available combination buttons which can be used to create over 8000 non-sequential combinations, and has a compact & robust zinc die cast body. Changing codes has been made particularly easy, which makes reinstating security quick & easy when codes have been compromised. The Securefast SBL320 is tested for external use to EN1670, and is supplied together with black neoprene seals.. Turn knob operation. Deadlocking tubular latch with 60mm Backset. 8000 possible code combinations. Holdback facility to allow unrestricted access