Easy Wood Tools 3 1/2&rdquo; Diameter x 1-1/4&rdquo; x 8 TPI Precision CNC Machined Anodized Aluminum Faceplate with Set Screws, 8 Large Mounting Screw Holes, Spanner Hole F635 100% designed and CNC precision machined in the USA 1-1/4 x 8 TPI threads 3 1/2" overall diameter Solid anodized aluminum, so wont rust or stain and minimizes tool damage if struck Low profile (1/2 thick plate) to reduce vibration 8 Large countersunk mounting holes and 5/16 spanner hole