TA-VIGOR 2Pcs 4mm Extra Long Twist Drill Bits, 160mm Length High-Speed Steel HSS Straight Shank Spiral Drill Bits for Wood Metal Aluminum Plastic

【Size & Package】Shank diameter: 4mm / 0.16" (approx.); Drill bit diameter: 4mm / 0.16" (approx.); Overall Length: 160mm / 6.3" (approx.); Package includes 2pcs 4mm straight shank drill bit. 【High Speed Steel】Made of HSS material, the extra long drill bit is hard enough, anti-bending and will not fracture easily. The surface coating can better protect the drill bit sets from corrosion and expand their longlife. 【Straight Shank】The round and straight shank is suitable for a wide variety of toolholding systems. Universal flute and overall length allow minimal adjustment during work. 【Double Cutting Edge】 The sharp cutting edge promotes faster as well as preciser drilling. Its spiral flute assure fast heat dissipation, protecting the 4mm long drill bit from high temperature damage and getting rid of glitches or scrap. 【Wide Application】The drill bits has use for drilling wood, wood, rubber, plastic, steel plate. It is widely used for drilling many electric drills, automobile spring steel and die steel.