BL4401MG. The Borg BL4401 Wooden Gate Digital Lock comes standard with a 60mm stainless steel latch and optional holdback facility which can be removed if not required. This non-handed medium-heavy duty digital lock is suitable for use on doors with a thickness of up to 80mm and has been specially designed to suit wooden and timber external applications. Coated with a Marine Grade Pro black finish which has been salt spray tested for over 1000 hours, you can be sure this unit will withstand the harshest of conditions.. Suitable for medium-heavy duty usage. Specifically designed for use on external wooden and timber gate applications. Marine Grade Pro black finish. Over 8000 code combinations available