Hope B mount. HBMB. 

This is a I.S to post mount adapter. 

Used on the front it's for a 203mm disc and used on the rear it's for a 183mm disc. 

I list items with UK postage included. This is for mainland UK only, BFPO locations please ask first as I get charged extra.

Please read the description carefully as I do not offer returns on items you bought by mistake!

Thank you.