Tap And Drill Bit Set, 2Pcs M4 X 0.7 Metric Spiral Flute Thread Screw Taps & 2Pcs 3.3Mm Twist Drill Bits, Roasted Yellow M35 HSS-CO Tapping Threading Tool Kit

2pcs Spiral Flute Taps:Thread size: M4 x 0.7 (right hand); thread length: 15.5mm / 0.61"; square shank: 3mm / 0.12"; total length: 56mm / 2.2"2pcs Twist Drill Bits:Drill size: 3.3mm (right hand); cutting edge length: 34.5mm / 1.36"; shank dia.: 3.3mm / 0.13"; total length: 65mm / 2.56"Descriptions: Thread tap adopts spiral flute design, with clear threads and no burrs. Screw tap provides upward chip removal, fast and precise tapping, suitable for processing blind holes and sticky materials. Twist drill bit adopts a spiral flute chip space design to remove chips quickly and cleanly. Cutting edges provide neat and smooth cuts. Use an appropriate lubricant (such as cutting fluid or oil) to reduce friction and heat build-up. M35 cobalt high-speed steel tap & drill bit set offers improved hardness, wear resistance and cutting performance, as well as and higher strength. Roasted yellow finish on thread tap and drill bit effectively removes oxidation on the metal surface, increases its corrosion resistance, and extends its service life. Tap and drill bit set is widely for cast iron, aluminum, stainless steel, carbon steel, aluminum alloy, bronze and hard plastics. Use with tapping oil to get higher quality threads and more durable taps. Machine tap is used on drill presses, tapping/CNC/milling machines. Not recommended for hand use and electric drill tapping. Tips:Drill holes with a twist drill bit first, then tap with a thread tap. The cutting angle should be 90 degrees vertical and stable. The higher the hardness, the slower the speed. Tapping depth should not exceed 1.5 times the diameter of tap.