PRODUCT INFORMATION: Quantity: 25 Center Of Hole To Edge: 5/16 in. Center To Center: 9/16 in. Inner Diameter: 3/8 in. Material: Galvanized Steel Coated With Black Vinyl (1/32 in.) Material Thickness: 0.048 in. Mounting Screw Size: 9/32 Top Of Radius To Base: 11/32 in. Type: Insulated Half-Clamp Width: 5/8 in. Made In: USA California Prop 65WARNING: This product can expose you to chemicals including Vinyl Chloride which is known to the State of California to cause Cancer. For more information go to www.P65Warnings.ca.gov.