Material: zinc alloy
Color: gold and silver
Inner Size: 18*6.3mm/0.71*0.25inch

Usage:
1.Take out the adjusting buckle.

2.Rotate the cylinder 180 degrees.

3.Hook the chain that needs to be shortened.

4.Rotate the cylinder 180 degrees to return to its original position.

5.Use a screwdriver to tighten the bottom screw until the cylinder cannot be rotated at will. (to readjust the length, loosen the bottom screw)