This is a set of step drills made of high speed steel 4241. Different Specifications:s can meet different drilling requirements.

Features:
Made of fine quality high speed steel, wear resistant, not easy to rust, has a long service life.
Double groove design for faster and smoother cutting.
Different Specifications:s can meet different drilling requirements.
Suitable for workpiece with hardness is less than 25 , such as carbon steel, iron plate, aluminum plate, pvc plate, wood board and so on.

Specifications:
Material: high speed steel 424;
Color: yellow;
Quantity: 5pcs;
Size:
1/4" to 1-3/8" (10 steps): 1/4", 3/8" 1/2", 5/8", 3/4", 7/8", 1", 1-1/8", 1-1/4", 1-3/8";
3/16" to 7/8" (12 steps): 3/16", 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8";
1/4" to 3/4" (9 steps): 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4";
1/8" to 1/2" (13 steps): 1/8", 5/32", 3/16", 7/32", 1/4", 9/32", 5/16", 11/32", 3/8", 13/32", 7/16", 15/32", 1/2";
3/16" to 1/2" (6 steps): 3/16", 1/4", 5/16", 3/8", 7/16", 1/2";
Shank diameter:
1/4" to 1-3/8": 8mm / 0.3in;
3/16" to 7/8": 8mm / 0.3in;
1/4" to 3/4": 8mm / 0.3in;
1/8" to 1/2": 6mm / 0.2in;
3/16" to 1/2": 6mm / 0.2in;
Package size: 154 120 43mm / 6.1 4.7 1.7in;
Package weight: 480g / 1.1lb;

Package list:
5 Step Drill