Speaker Spacer for Wet Sounds REVO 10 HP/FA S4 - 10" 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 - 11.02" or 226 mmBolt Hole Circle Diameter - 9.68" or 203 mmMounting Hole Diameter - 9.45" or 180 mmCompatible With 10" REVO 10 HP/FA S4:REVO 10 HP S4-B V2, REVO 10 FA S4-B V2, REVO 10 FA S4-W V2, REVO 10 FA S2-B V2 and REVO 10 FA S2-W V2*Sold as a Pair