All Nupeg hooks/bins/shelves are designed off the industry standard (wood fiber) peg board which can be purchased in common stores like Home Depot, Lowe's, etc. These peg boards all have the same universal design.
-Hole diameter 1/4 inch or 6.35 mm
-Distance between holes 1 inch or 2.54 cm

I also have hooks/bins/shelves designed for metal peg boards. The metal peg board I purchased from Amazon follows the universal design however the holes are 7.2 mm. Other metal peg boards might be different. If you would like to purchase an item from me, reach out first and give me the exact specifications of your metal peg board.