6759 6-1/2in Crain 821 Carbide Tipped Repl Blade by Gundlach 6-1/2″ Crain 821 Carbide Tipped Repl Blade 40 tooth, carbide-tipped. Best for undercutting along walls and door jambs. For the Crain 812 and 820 saws. . Posted in Crain, Shop by Brand tagged with Gundlach