Shank Diameter: 8mm, Cutting Diameter: (12.7mm)1/2", Blade Height: 25mm(Please get the promo code on the product page when purchasing to get a cheaper price.) The top and bottom bearing router bit is great for all your common large trim applications This bit can be used with either a top or bottom jig. Especially useful for jig work when routing rounded or curvy wood with sensitive end grains Cutter: CNC ground to a 600 grit, mirror finish Carbide Tipped - Micro grain grade provides increased strength and greater resistance Size:8mm Trim Router 25mm Blade Feature: The top and bottom bearing router bit is great for all your large routine trim applications. This bit can be used with either a top or bottom jig. Especially useful for jig work when routing wood. rounded or curvy with sensitive end grains. The upper and lower bearings allow you to turn the wood over when you reach the 'up grain' and unwind it in a 'down' direction, maintaining uniform smoothness around the workpiece. Cutter: CNC milled to a 600 grit, mirror finish. Hook and Shear Angles: High hook and shear angles allow the cutters to cut easily into stock, producing a clean, splinter-free product. Bearing: Totally enclosed and lubricated. Coating: Baked on heat resistant coating to prevent the buildup of sawdust, resin and pitch. Balance: +/- .003" tolerance (allowing smooth operation at high RPMs). Specification: Body: Solid hardened steel. Blade: Industrial grade micro grain carbide. Shank Diameter: Approx. 8mm. Cutting Diameter: Approx. 12.7mm (1/2"). Overall Length: Approx. 87mm. Blade Height: Approx. 25mm. Quantity: 1pc. Application: Be used with a top or bottom jig. Particularly useful for jig work when routing rounded or curvy wood with sensitive end grains. Contents: 1 x 8mm Shank Flush Trim Router Bit