CMT 794.321 3-Pcs HS Planer and Jointer Knives, 12-1/4-Inch Length Knife size: 12-1/2-inch in Length, 11/16-inch in Height and 1/8-inch in thickness. Suitable for cutting dry softwood, dry and wet hardwood. Carefully ground from fine European high speed steel. These knives produce high quality finish.