This is for a Polk Audio Set Of 4 Rubber Grill Grommets From a CS400i Center Channel Speaker.  They are in good condition and may show some very minor marks.  See all pictures for condition. This may work for other Polk models as well.  Please do your research before purchase. Each measures 1/2" Wide X 1/2" D.  The cabinet hole size is 3/8".  Feel free to message any questions.  Combine auctions to save on shipping.  Please use the shipping calculator for rates via USPS mail.   Delivery confirmation is included.  Please Email any questions. See my other auctions for more Polk Audio Speaker parts, other speakers, stereo parts, electronics, and other collectible items.