25mm Webbing Buckles. These are quite curved so better at going roundish objects like waists, barrels etc. I have shown the profile in one of the images.
The size given is the size of webbing that will fit neatly through the slot. The overall size is bigger at 32mm by 68mm.
You can purchase 1 , 2, or 4 buckles using the selection box.
They can be used to update repair or update bags, Rucksacks, wrist straps etc
The more you buy the cheaper they will work out per buckle.
Please look carefully at the images as they will help in selecting your item.