When pull handles are needed on both sides of a door – for example a double action door which swings both ways – back-to-back pull handles are purchased in sets. The bolts pass through the door and fix into the handle on the other side using a grubscrew hidden on the underside. This method makes them very strong and unlikely to loosen over time, like surface mounted pull handles sometimes do. Back-to-back pull handles can be used on timber doors AND frameless glass doors. If using on glass, you’ll need to get the glass drilled before it’s toughened. The usual bolt thread is 8mm diameter (M8), but it’s always best to get the handles before doing the drilling, because if may differ. Tiny clear plastic washers are supplied for use on glass doors.