3-12mm 4-12mm 4-20mm Drilling Tools Straight Groove Step Drill Bit Titanium

Features: 100% Brand New and High Quality Made from high quality HSS steel Ideal for using to cut holes in a variety of materials including steel, bra, wood, plastic, etc. Rotating speed: 3-12 speed:260-400 4-12 speed:260-400 4-20 Speed:180-240 Attention: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 pre down too hard to avoid the edge wearing. Suitable material: Workpieces with general hardne, such as wood, plastic, PVC plate, iron plate, plate thickne within 3MM. Please note that stainle steel and spring steel are not applicable. Not for quenching. (Water injection cooling while working, it can effectively extend the service life of the drill bit, especially in the case of continuous drilling) Length: 3-12mm Length: Approx. 7.9cm/ 3.11" 4-12mm Length: Approx. 6.7cm/ 2.64" 4-20mm Length: Approx. 7.4cm/ 2.91" The Cutters Come in the Following Sizes: 3-12mm(3mm,4mm,5mm,6mm,7mm,8mm,9mm,10mm,11mm,12mm) 10 Steps 4-12mm: (4mm, 6mm, 8mm, 10mm, 12mm) 5 Steps 4-20mm:( 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm)9 Steps Package includes: 1 x Drill Bit 3-12mm 1 x Drill Bit 4-12mm 1 x Drill Bit 4-20mm 1x Bag Note: Please be sure to check the size of the drill bit before ordering! So as not to cause unneceary loes. About shping
Shping and Packaging All it will be double checked and well packed before sending.It will be dispatched within 2 business days after buyers pay for the order. It usually takes about 14 to 18 working days for delivering the package to the destination(for e areas,it may take a little longer). 

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