The Floor King 65040 is a carbide-tipped saw blade designed as a compatible replacement for the Crain 821 blade, specifically engineered for use with Crain jamb and undercut saws such as models #812, #820, and #825. This 6-1/2-inch diameter blade features 40 teeth with an Alternate Top Bevel (ATB) grind, a 7/8-inch concave bore, a 19° hook angle, and a 2.5mm kerf, making it ideal for precise undercutting of door jambs, baseboards, cabinet toe kicks, and flooring installations.