These  high quality metal 1" Vest/Waistcoat Buckle / Adjustable Slide w/ Teeth and gripper bar  dark silver/nickle finish fit 1 inch (25mm) webbing/belt straps. The teeth and gripper bar on the inside of the buckle helps with locking in the belt strap/webbing and keeping it from unwanted movement.  

They are sold in lots of 2, 6 and 10. 

Check out my store for more buckles and buttons.