1.material: HSS,TC or carbon steel with black finished 2.size;30mm-120mm 3.max speed is 900rpm with diameter up to 115mm

1.material: HSS,TC or carbon steel with black finished2.size:30mm-120mm(metric),1/4"-5"(imperial)3.max speed is 900rpm with diameter up to 115mm

4.hex balance bar

5.packing:blister card or as your requirements

6.Fits most variable speed rotary or staionary pillar drills

adjustable circle hole cutter