step drill bits with titanium nitride coating FREE SHIPPING |high speed steel 4241 Pagoda Drill Ladder for holes 4-32mm | Инструменты

step drill bits with titanium nitride coating FREE SHIPPING |high speed steel 4241 Pagoda Drill Ladder for holes 4-32mm | Инструменты

step drill bits with titanium nitride coating FREE SHIPPING |high speed steel 4241 Pagoda Drill Ladder Drill for holes 4-32mm.

size: 4,6,8,10,12,14,16,18,20,22,24,26,28,30,32mm.

high speed steel 4241 drill bits are used for the hardness of the material which is below 25°, like iron borad, steel board, PVC board, Insulation board, etc.

if you want drill holes in the hardness of the material which is below 28°, like aluminum alloy, stainless steel board, please use high speed steel 6542/ M2 drill bits.

features:

1.  special step stucture, 1 ncctec bit can drill different sizas holes, 1 step bits can instead of 1 box of other bits.

2. don't need the center punch, it is not easily broken compare with normal twist drill bits.

3. it can do chamfering, deburring and drill Ellipse holes.

4. working with water cooling, can effectively extend the service life of bit, drilling speed 250--400 recommendation.

the default shank is 6mm Triangle Shank, if you want round handle,triangular handle,hex shank,SDS shank, please tell us, if you don't tell us, we will send the default shank to you, thanks.