Speaker Spacer for JL Audio M & M7 Series 12" Subwoofer - .50" - WhiteDon't have enough depth to install your speaker/subwoofer?  Problem solved these spacer rings give you that extra space needed to mount your speaker/subwoofer.Specifications:Thickness - .50"Edge - 1/16" RoundOuter Diameter - 14" or 356 mmBolt Hole Circle Diameter - 12.06" or 306 mmMounting Hole Diameter - 12.81" or 325 mmCompatible With 12":M12IB6-SG-WH, M12IB6-CG-WH, M12IB6-CG-TB and M12IB6-SG-TM7-12IB-C-GwGw-i-4, M7-12IB-S-GwGw-i-4, M7-12IB-S-GmTi-i-4, M7-12IB-C-GwGw-4, M7-12IB-S-GwGw-4 and M7-12IB-S-GmTi-4*Sold as a Pair