Speaker Spacer for Wet Sounds REVO 12 HP/FA S4 - 12" Series Subwoofer - .50" - BlackDon'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 - 12.68" or 322 mmBolt Hole Circle Diameter - 12.26" or 311 mmMounting Hole Diameter - 11.26" or 286 mmCompatible With 12" REVO 12 HP/FA S4:REVO 12 HP S4-B V2, REVO 12 FA S4-W V2, REVO 12 FA S2-B V2, REVO 12 FA S2-W and REVO 12 FA S4-B V2*Sold as a Pair