Four (4) medium extra tall round black non marking rubber feet with metal insert for extra strength. The dimensions are .625 inch Tall x .932 inch Top Width x .844 inch Bottom Width Center Hole – Recess Diameter .359 inch / Recess Depth .327 inchAccepts a number 8 round head bolt or .178 screw. These are high quality Thermoplastic Rubber feet The durometer (hardness) is 87 The metal insert can be removed to accommodate a larger bolt / screw. This item is perfect for radio gear, cabinets, amps and other items that require rubber feet.