Made from Durable DELRIN Plastic and is Easy-to-Install on the Mask with a Hex Key Wrench. Once mounted, your Camera and Housing can be attached to your Mask when needed and you can Film your Underwater Adventures with Ease. Made from Durable DELRIN Plastic and is Easy-to-Install on the Mask with a Hex Key Wrench. Once mounted, your Camera and Housing can be attached to your Mask when needed and you can Film your Underwater Adventures with Ease.- Hands Free Photography Capabilities.- Fits: Hollis M3 Mask.- Mount your GOPRO Camera and Housing on Mask.- Durable DELRIN Plastic Construction.- Easy-to-Install with Hex Key Wrench.- Film Underwater Adventures with Ease.