3 Hole - Center Tap Base Plate, Inch, For Profile Type Double, Fastener Thread Size 3/18 In.-16, Anodized, Overall Height 3 in, Aluminum, 15 Series, Includes Fasteners No, Overall Depth 3/4 in, Overall Width 1 1/2 in, Mounting Hole Diameter 5/16 in, Required Tap Thread Size 3/8 In.-16, Fastener Mounting Type Drop In, Adjustable Yes, White, Compatible Brand and Series 80/20, 15 Series, Compatible Manufacturer Model Number 1515, 1530, Includes Tap