The Yale Door Closer 2300 Series are no longer manufactured, but they were the same as the Norton 9300 Series. If you order this product, you will receive the Norton equivalent. The Norton Door Closer 9300 is a lighter weight version of the Yale 50 Series. This door closer is a Grade 3 closer, and is designed for light commercial use. This door closer has a fixed spring, so the tension can not be adjusted. The version we send is for a 36” door, and features adjustable closing, latching and back check speeds. The hole spacing on this door closer is 3/4” x 9-1/16”.