BL5201MG. The BL5201MG digital lock is part of Borg's Marine Grade Pro series which have been specially designed for marine applications where ISPS compliance is necessary. This non-handed medium to heavy duty digital lock is suitable for use on DDA applications and comes with a 60mm latch, 12 large indented buttons and a clutched handle which protects against forced entry and lock damage. Cycle tested to 100,000 operations and salt spray tested for over 1000 hours, the BL5201MG is a digital lock for the toughest environments.. Weatherproof design. Optional free passage function. ISPS Compliant. Over 2000 code combinations available