Custom Hinge Selection Tool
Holes : Round
Holes are just one example of perforations that can be done on a hinge, but by far the most common. The typical hole is round and is specified by a diameter dimension.
on each leaf
Any number of holes can be specified to be drilled or punched in the leaves. This particular hinge has 2 holes on each leaf.
Or two or more sets of dimensions and hole centers may need to be noted as with a hinge with staggered holes.