3Pcs High Speed Steel HSS Titanium Coated Spiral Step Drill Bit Set， 4-12/4-20/4-32mm 29Sizes， 1/4" Hex Shaft Drive Quick Change Multiple Industrial DIY Woodworking Punching Tools by Jelbo …[Product Information]- ✅ 1/4" Hex shaft drives are suitable for all kinds of power drills.
- ✅ Double cutting blade design makes for cutting faster，automatic deburring from hole when drilling.
- ✅ 3Pcs spiral step drill bits， 4-12/4-20/4-32mm 29Sizes，main material high speed steel， titanium coated high quality step drill bits.
- ✅ Step drill， also known as stepped drill or pagoda drill， mainly for wood and steel drilling processing.More steps and dense make the hole smoother.
- ✅ 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.
