Timber thread inserts are very useful as they can be tightened and loosened an unlimited amount of times. If you tighten and loosen a normal wood screw eventually it will enlarge the hole and will not grip as well, by using timber thread inserts you can overcome this problem. The timber thread inserts are also self-cutting so you simply drill the correct size hole and the insert will cut its own thread when it is screwed into position. Timber thread inserts can also be used when fixing to the edge of another piece of timber, making them extremely useful.