3 Review(s)

-- High speed, titanium nit-ride coated steel Replaces 28 separate drill bits Two fluted design for fast, smooth cutting.-- When inject cold water while working, can effectively extend the service life of the drill bit. Recommend drilling rate of 250-250 RPM.-- 1mm thickness can be operated by hand drill, 2~3mm please use bench drill. The drill must continue to cool down when it is working, and it is not easy to burn.-- According to the need to process different diameter holes, you can achieve one-time processing of large holes, no need to replace the drill bit and positioning hole.Material: high speed steelSurface Treatment: TitaniumThe Cutters Come in the Following Sizes:4-12mm: (4mm, 6mm, 8mm, 10mm, 12mm) 5 Steps4-20mm:( 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm)9 Steps4-32mm (4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm, 30mm, 32mm)15 StepsPackage included:1 x Drill Bit 4-12mm1 x Drill Bit 4-20mm1 x Drill Bit 4-32mm1x BagAttention:-Because of the outer diameter of each step of the step drill is gradually expanded,then the corresponding cutting resistance and linear velocity will also be gradually increased. -Owing to the step drill is completely dependent on the inclined edge that is only with 1mm length,If the feed speed is too fast when drilling,it will be easily to be annealing caused by abrasion of the oblique edge.-Please give a downward force when drilling, do not press down too hard to avoid the edge wearing.Notes:1-2cm error might exist due to manual measurements, please kindly understand.The colors deviation might differ due to different monitor settings.We provide you with the best product and service. If you have any problem, please let us know, and we will solve the problem for you. Thank you so much