50mm Frame SGLD50. The Gatemaster SGLD Double Sided Sliding Digital Gate Lock is a high quality, heavy duty lock to secure any unit with a sliding gate; this double sided version is supplied with combination keypads on both sides of the lock. No power is required to operate it so no complicated wires are required, simply drill 3 holes and bolt on to the gate. It is made from stainless steel and powder coated for maximum resistance against the elements. This product is provided complete with a keep which increases security as it prevents access to the latch bolt when the gate is closed and improves the overall appearance of the gate.. Easy to fit - Slim 70mm (2 3/4") wide lock case. Latchbolt projects into the keep (provided) which increases security and improves gate appearance. Auto-Latching, the latch bolt latches into the gate frame when you close the gate. This lock has keypads on both sides