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 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 63mm4 20mm 4 6 8 10 12 14 16 18 20 mm 73mm4 32mm 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 mm 100mmShank 4 12mm 5mm dia 20mm L 4 20mm 7mm dia 23mm L 4 30mm 9mm dia 25mm L Case 125x95x35mmPlease allow 1 2mm measurement error Package included 1x 4 32mm Pagoda Drill1x 4 20mm Pagoda Drill1x 4 12mm Pagoda Drill