Here is a  Birel/Art 50  mm   clamp for 50 mm blue hub. The combo is shown in the last photo as an application but only the clamp is being offered in this listing as shown in photo one. The pinch bolt is included and is coated as shown This is the latest version  Sold by the piece.

 Please examine  this product closely  to insure it is something that you can use. It is better to ask questions in advance than after the purchase.

 Managing customer expectations is the most difficult thing to do with photos and text. Please study carefully.   We offer our support line to answer any questions you may have M-F  9 - 5 Eastern.

You are also welcome to text me 7 days a week  or tech advice. .  All of these items are on close out and I am sorry we cannot offer returns, please make sure to ask questions if you are in doubt.  We are prompt in our response.