GRIP Hardware Hangers & Holders Foam Core Holder Swivel Watch this product and we will notify you once it is back in stock. The product is now watched We will notify you once the product is back in stock again. E-mail Watch this product Your personal information is processed in accordance with our privacy policy. Foam Core Holder Swivel Foam Core Holder SwivelFlat aluminum plate w/swivel pin used to attach a piece of foam core or small mirror onto a gobo/grip head.