Four (4) small super soft round non marking rubber feet with removable metal insert for extra strength. The dimensions are a little larger than 1/2 inch wide (.671) and 1/4 inch (.250) in height - see below. These are high-quality thermoplastic rubber feet. The durometer (hardness) is 64 shore A. The metal insert center hole is .155 inches wide and accepts a #6 truss head bolt or #6 screw and can be removed to accommodate a larger bolt/screw. This item is perfect for small radio gear, cutting boards, electronics, crafts and other items that require small rubber feet. Food safe, BPA Free & Restrictive of Hazardous Substances Quantity - 4 Color - Black Description - Small Super Soft Round Thermoplastic Rubber Non-Marking Rubber Foot Height - .250 (1/4 inch) or 6.350 mm Top Width - .671 (little larger than 1/2 inch) or 17.043 mm Tapered Bottom Width - .583 (little larger than 1/2 inch) or 14.808 mm Removable Metal Insert Center Hole Size - .155 inch or 3.937 mm Recessed Screw Size - .125 inch or 3.175 mm Bolt / Screw Size - Accepts #6 Truss Head or #6 Screw Material - Thermoplastic Rubber Durometer - 64 Shore A REACH & RoHS Compliant - Restrictive of Hazardous Substances / Conflict Mineral Free / 3TG, BPA Free - Proudly Made in the USA.