Ruland manufacturing is a great
Ruland manufacturing is a great resource for high quality machined parts like the aluminum split shaft collars with two flat mounting tapped holes - that I recently purchased.
When you check out their shaft collars there is so much variety with both metric and English dimensions for the ID, OD, thickness, thread size and thickness. Shipping of these collars was free and the workmanship was excellent. They were well packaged and shipped on time.
I recommend Ruland shaft collars along with other products that they manufacture and sell on their website.