Bi-metal, Wavy set design ensures sharp cutting edges are always in contact with material for faster cutting, Matrix II steel with 8 percent cobalt provides maximum durability, 3? shank angle positions the blade for most efficient cutting action resulting in longer blade life, Straight back blade type, 18 tpi, 4"" length, 5 per card, Length: 5, 5, Width: 2, 66, Height: 1 SKU: JNSN24439