This 2-1/8 inch size is common on many interior and exterior door handles and bolt kits. So far the hole saw has cut a few doors well. Many hole saws can be fitted to gazebos from other companies. In this case, the small hole saw fits easily on my DeWalt DW1803 mandrel. It was also installed on two different Milwaukee mandrels but didn't fit as well. Either way, this is a fine hole saw in this popular size.