35 mm / Inner width 36 mm x  Inner height 8 mm / Brass 27 g / $ 10
40 mm / Inner width 41 mm x Inner height 9 mm / Brass 29 g / $ 11
45 mm / Inner width 46 mm x Inner height 9 mm  / Brass 40 g / $ 12

This is a quality solid brass belt keeper loop.
They can stop moving the end of the belt. Also, looks really cool.
This loop is made by casting by skilled Japanese craftsmen.
 
Material / Solid brass
 
Color / Raw brass, Nickel, Matte nickel, Matte black