TOOL SPECS: Solid carbide, top/bottom bearing, 2+2 compression spiral with 7/8" cutting diameter, 1/2" shank, 1-5/8" cutting length, and 4-1/4" overall for use in routers with a 1/2" collet. ULTIMATE FLUSH TRIM: These heavy-duty solid carbide bits are made from premium micro-grain carbide and induction brazed onto a 1/2" steel shank for enhanced strength and performance. CUTTING HEAD: The 7/8" diameter provides a broader sweep of the cutting edge than smaller bits, allowing for shearing of wood fibers and perfectly smooth cuts even in difficult wood grain. BEARINGS: Available with top and bottom bearings in 1-3/8", 1-5/8", and 2-1/8" cutting lengths for versatile and precise routing applications. COMPRESSION SPIRAL: Designed with up cut and down cut edges, this tools performs like two separate bits, providing the many benefits of both styles in one tool. MACHINES: For use in hand routers and router tables. Choose a cutting length that closely matches the material thickness for best performance. The Whiteside UDC9163 is an ultra-long combination bit ideal for flush trimming thick stock up to 1-5/8 inches. Featuring a 1/2-inch shank and cutting diameter of 7/8 inches, this bit can flush trim edges with incredible precision thanks to its compression-designed 1-5/8 inch cutting length. Whether trimming solid wood, laminates, or veneers, the UDC9163 delivers an ultra-clean, crisp edge on both the top and bottom surfaces through even the most difficult grains. As with all Whiteside bits, quality craftsmanship and materials ensure optimal performance, from smooth plunging and routing to easy cleanup. Ideal for cabinetry, furniture, molding, and more, the UDC9163 ultra-long flush trim bit enables professional results on projects of any scale.