THIS IS FOR (QTY 2) MDF 6.5 GR INCH SPEAKER RINGS INSIDE DIAMITER --- 5 3/4 INCHES OUTSIDE DIAMITER ---- 7 11/16 INCHES THICKNESS ---- 1 INCH CUT OUT DEPTH--- 5/16 CUT OUT WIDTH---7 1/4 ALL RINGS ARE MACHINED FOR PERFECT ACCURACY PLEASE CONTACT US FOR CUSTOM CUT RINGS & SIZES WE HAVE MULTIPLE MDF RING SIZES & STYLES THESE ARE GREAT FOR BUILDING FIBERGLASS BOXES, CUSTOM SPACERS