MILWAUKEE 4MM - 30MM SHOCKWAVE IMPACT DUTY STEP DRILL BITSHOCKWAVE? Impact Duty step drills are designed to deliver best-in-class performance in impact drivers and also the versatility to be used in drill drivers.The 1/4" Hex shank with an optimised SHOCKZONE? ensures maximum durability by preventing early shank breaks.New Titanium Aluminium Nitride (TiAIN) coating helps to reduce heat generation for 5x more life.RAPID STRIKE TIP?: Accurate start without walking and fast drilling without the need to pre-drill the material.Dual spiral flute design: Optimised for impact driver speed and for smooth, jam-free drilling.Laser engraved markings: Do not wear away with time.4-30mmNumber of Steps - 14Overall Length - 95mm1/4" HexWeight0.149 kgLength75 mmHeight35 mmWidth164 mm