1.The screw has loosened.
3.To clinch(a bolt, for example).
4.The screw worked (itself) loose.
5.remove the thread (of screws).
6.“It turned out to be a screw.
7.Turn the key; turn a screw.
8.A tool for making a countersink.
9.Verify strengthening all the screws.
10.Had better use nickel-plating screw or stainless screw and waterproof glue to install the material.