AKROH Industries has a variance of buckles available for collars. For every bandwidth AKROH offers different buckles.Available for the 25 mm collars is the roll buckle, article number 399857, which you can see in the picture. Beside this buckle AKROH also has the thorn buckle, article number 399956 in stock for the 25 mm collars.
If you are interested, but your desired buckle or collar is not available? Ask below for the possibilities.
This is a metal part.