0.59 inch Depth extenders: With 6.5 inch speaker subwoofer spacer rings, you can install the speakers you want adding extra depth; Good for DIY Audio modification project 6.5 inch stereo sturdy speaker ring: Inner Diameter 144 mm / 5.67 inch; Outer Diameter: 180 mm/ 7.09 inch; Thickness: 15 mm/0.59 inch; Universal spacer ring works with most 6.5 inch speakers; Please allow 1-2 mm error due to manual measurement 6.5 inch plastic speaker spacer adapter ring allows for replacement speakers to be installed into the original aperture of your vehicle stereo system Easy to install: Utilizes existing vehicle mounting points, and requires no cutting or drilling The 6 1/2 inch speaker ring bracket made of durable ABS plastic and good craftsmanship for durability and practicality