High speed steel constructionSteam oxide coatingPatented 2 cutting flutes
' Step Drill Bit Set, Material HSS, Steam Oxide Finish, Number of Pieces 4, Number of Hole Sizes 28, Size Range 1/8 In. to 1-3/8 In., Sizes Included 1/8 In., 5/32 In., 1/4 In., 5/16 In., 3/16 In., 7/32 In., 3/8 In., 1/4 In., 9/32 In., 5/16 In., 11/32 In., 3/8 In., 13/32 In., 7/16 In., 1/2 In., 9/16 In., 5/8 In., 11/16 In., 3/4 In., 13/16 In., 7/8 In., 1-1/8 In., 1-7/32 In., 1-1/4 In., 1-3/8 In., Step Thickness 1/32 In., 1/16 In., 1/4 In., Number of Flutes 2, Shank Size 1/4 In., 3/8 In. '
Brand: Lenox, Model: 30929VB30929, Size: 1/4", 3/8"