3pcs HSS Step Drill/Pagoda Drill/Ladder Drill Round Shank 4-12/4-20/4-32

Description:

Mainly used within 3mm sheet steel drilling, a drill bit can replace the use of multi-branch;according to the needs of different diameter hole, and can achieve big hole to complete a one-time processing, without having to change the drill bit and hit the positioning holes and so on.

Features:
1, The ladder of its unique structure, a bit can open a variety of specifications of aperture.
2, Do not need to use center punch, compared with the ordinary twist drill is not easy to be broken.
3, Deburring, chamfering, elliptic hole enlargement, twist drill, the function of them  was unable, but it is possible.

Manufacturing:
The overall ladder drill using CBN grinding whole manufacturing, the main material for high-speed steel, carbide, high precision machining,according to different processing conditions can be surface coating to extend tool life, add to enhance durability.

Specification:
Material:High speed steel                        
Size:
4-12mm (4, 6, 8, 10, 12) mm  / 63mm
4-20mm (4, 6, 8, 10, 12, 14, 16, 18, 20) mm/ 73mm
4-32mm (4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32)mm / 100mm

Shank:
4-12mm: 5mm(dia),20mm(L)
4-20mm: 7mm(dia),23mm(L)
4-30mm: 9mm(dia),25mm(L)
Case:125x95x35mm
Please allow 1-2mm measurement error.
      
Package included:
1x 4-32mm Pagoda Drill
1x 4-20mm Pagoda Drill
1x 4-12mm Pagoda Drill