[4-20mm 9 ladder]

[4-12mm 5 ladder]

Handicraft 4-12mm hss step drill is ideal for precision machining holes of aluminum, brass, copper and plastic, but steel and wood. Manufactured from high-speed steel for increased durability and cutting power. Coated titanium to reduce friction and heat 2mm hole 12mm? Produces 4 mm.
Description:
Its unique structure ladder allows you to reveal a variety of specifications with a slightly opening.
No need to use a center punch and it is easier to break compared to regular twist drills.
Ensures perfect round holes in the sheet metal with their unique design.
Deburring and chamfering, enlarging the oval hole, drilling, and other functions are unavailable.
Tool Application: Drill, Bench Drill. Working while cooling water can extend the life of the drill bit.
Specifications:
Size:4-12 mm(4,6,8,10,12mm)
Shank: 0.3 inch (7.1 mm) (dia)
Total: 6.5cm(L)
Package included:
1 x Hex Titanium Step Drill.