Ocean Breeze Marine Speaker Spacer f/Infinity Kappa Series 8" Speakers - .75" - BlackSpeaker Spacer for Infinity Kappa Series 8" Speakers . 75" Black Don'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 . 75" Edge 1 16" Round Outer Diameter 9. 5" or 241 mm Bolt Hole Circle Diameter 8. 09" or 205 mm Mounting Hole Diameter 7" or 178 mm Compatible With 8" Reference: KAPPA8130MAM and KAPPA8135MAM *Sold as a