Surface Fixed. The GATEMASTER SLDS Superlatch is a marine grade digital keypad with a simple and reliable stainless steel mechanism to open from inside the gate. It is auto-latching so simply close the gate and the latch catches onto the strike plate. To open from the outside enter the code and turn the handle, from inside you just twist the latch.. Digital keypad and internal shroud. Internal mechanism easily reversible for left and right hand gates. Auto-latching. Code entry from outside