Lens cap will fit Canon FD 35-70mm f3.5-4.5 lenses. And 28-50mm FD lenses.  So please make sure that your lens has 52mm or it will not fit. Please note that it will not fit other Canon FD lenses, other then 35-70mm and 28-50mm. 

Cap has been used, but it looks very nice. It is not too tight, or too loose. This cap is fully operational and functions as intended.  I would rate it an 8, on a scale from 1 to 10.