Are they any good? Is the 'pull' adjustable? Does the long part with the spring fit in the frame or the door? How long is the spring pocket/ how deep would the drill need to go?
If the spring side fits in the door, has anyone found a reliable technique for drilling deep into the edge of a door by hand, without bursting through a face due to misalignment of the drill?
A few months ago I replaced 7x internal doors. During drilling for the latch of one, I managed to burst slightly through the face - luckily the damage was completely hidden by the door handle.