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

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: Size:? 4-12mm（4,?6,?8,?10,?12）mm 4-25mm（4,?6,?8,?10,?12,?14,?16,?18,?20）mm 4-32mm（4,?6,?8,?10,?12,?14,?16,?18,?20,?22,?24,?26,?28,?30,?32）mm ? Shank: 4-12mm:?5mm(dia),20mm(L) 4-20mm:?7mm(dia),23mm(L) 4-30mm:?9mm(dia),25mm(L) ? Total(L):63,73,100mm Case:125x95x35mm Allow?1-2mm?measurement?error. Material:High?speed?steel?????????????????????????????????????? ? Package?include 3X??Titanium?Step?Drills










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