Well used Downhill chain device. It looks like the back plate is slightly bent and could do with being put in a vice and straightening out.
RooX Chaindog / Roller-Coaster Chain Device Guide BB Mounted Retro MRP Retro MTB
RooX chain dog With roller coaster tensioner chain device guard ISCG03 Sku5152
Roox MTB Chain Guide Tensioner Roller-Coaster Retro Mountain Bike Downhill Gold
