Description: High-grade welding, stable quality, high efficiency. Using for kinds of woodworking. Totally enclosed and lubricated . Carbide Tipped - Micro grain grade provides increased strength and utmost resistance. Made of high quality metarial, durable and stable. Specification: Color: Yellow Material: Alloy Shank diameter: 8mm / 0.31inch Bearing diameter: Approx. 19mm(0.75inch) & 22mm(0.87inch) & 25mm(0.98inch) Blade length: Approx. 10mm (0.39") & 9.5mm (0.37") & 13mm (0.51") Total length: Approx. 53mm (2.08") & Approx. 52mm (2.04") & 55mm (2.16") Package Includes: 1 Set of Trim Router Bit (3 Pack?