The Whiteside UDC9213 ULTRA-LONG ULTIMATE TRIM COMBINATION. 1/2"SHANK 7/8"CUTTING DIAMETER 2-1/8"CUTTING LENGTH is a heavy-duty router bit well-suited for flush trimming thick stock. With a compression design and extra-long 2-1/8 inch cutting length, this bit delivers the clean, crisp edges professionals demand on material up to 2-1/8 inches thick. The 1/2 inch shank and 7/8 inch cutting diameter provide robust performance even with difficult grains. Whether trimming solid wood doors, furniture, molding or trim, this "Ultra-Long ULTIMATE" flush trim bit from Whiteside cuts through stock with authority, leaving tops and bottoms perfectly flush. Its long-wearing construction ensures reliable cuts for years to come. The broader sweep achieved with the 7/8” diameter cutter head allows for greater shearing action along the cutting edge of the tool when compared to 1/4” and 1/2” diameter tooling. This feature greatly reduces tear out and provides superior results even in difficult wood grains, resulting in minimal sanding of the finished cut.