16101 Model Code: AB - Price is for 1 Each (part# 16101) This item features: -Titanium Nitride finish causes less friction which increases speed and increases product life by 6X. -New SpeedPoint tip provides 6X faster initial penetration time than before, and eliminates the need for center punching. -Single-fluted cutting edge assures true round holes, and allows greater control with less vibration. -Brand Name: Unibit . -Finish: TiN. -Type: Step Drill Bit. Model Code Model Description AACutting Diam:4 mm [Min], 12 mm [Max], Material Thickness:11 mm [Max], No. of Steps:5, Shank Diam:1/4 in, 6.500 mm ABCutting Diam:4 mm [Min], 12 mm [Max], Material Thickness:5 mm [Max], No. of Steps:9, Shank Diam:1/4 in, 6.500 mm ACCutting Diam:4 mm [Min], 22 mm [Max], Material Thickness:5 mm [Max], No. of Steps:10, Shank Diam:3/8 in, 10 mm ADCutting Diam:6 mm [Min], 18 mm [Max], Material Thickness:5 mm [Max], No. of Steps:7, Shank Diam:3/8 in, 10 mm