Shank Diameter: 8mm, Cutting Diameter: (12.7mm)1/2& 34;, Blade Height: 25mm(Please receive promo code on product page upon purchase to get a better price.) The upper and lower rolling router bit is great for all your common large trim applications This bit can be used with an upper jig or lower. Especially useful for jig work when routing rounded or winding wood with sensitive end grains Cutter: CNC ground to 600 grit, mirror finish Carbide tipped - Micro grit grade provides the increased strength and greatest toughness Size:8mm Trim Router 25mm Blade Feature: The Upper and Lower Rolling Router Bit is great for all your common large trim applications This bit can be used with an upper or lower jig. Especially useful for jig work when routing rounded or winding lumber with sensitive end grains Upper and lower bearings allow you to turn the lumber when you reach the "upward grain" and unroll it in a "downward" direction, maintaining an even smoothness around the workpiece Cutter: CNC ground to 600 grit, mirror finish Hook and Shear Angles: High hook and shear angles allow the cutters to easily cut through stock, producing a clean, splinter-free product. Bearing: Fully enclosed and lubricated Coating: Baked on heat resistant coating to prevent build up of sawdust, resin and pitch. Balance: Tolerance of +/- .003& 39; 34; (allowing smooth operation at high rpm) Specification: Body: Solid hardened steel Blade: Industrial grade micro grain carbide Shank diameter: about 8mm Cutting diameter: about 12.7mm (1/2') Overall length: about 87mm Blade height: about 25mm Quantity: 1pc Application: Be used with top or bottom jig. Particularly useful for jig work when routing rounded or winding wood with sensitive end grains. Contneu: 1 x 8mm Flush Trim Router Shank