937G Rear Wheel Support Assembly Handle.  This is the handle only.  If you are looking for the full assembly the part # is 937

Used on the 945K, 945-4 & 945-4 Quick Change belt tension assembly.  

This part fits the Burr King 960-272, 960-250 & 960-400 belt grinder quick change.  This part is also used in some specialty grinders that Burr King manufactures.