SYNTHES 03.010.101S 4.2mm Three-Fluted Drill Bit QC/Needle Point/145mm Sterile (X) – GB TECH USA
4.2 mm Dia. x 6 mm Shank x 24 mm Flute Length x 66 mm OAL, 3xD, TiAlCN, 2 Flute, Coolant Thru, h6, Cylindrical, Solid Carbide Drill Series/List #NG11 MU061125688 - First Industrial Supplies
stryker 1320-3042 4.2mm orthopedic drill bit lot of 6 | eBay
4.1mm 4.2mm 4.3mm 4.4mm 4.5mm 126mm Extra Long Plastic Metal Wood Brass AL High Speed Steel HSS Straight Shank Twist Drill Bit - AliExpress
SGS 63005 | 4.2mm Diameter x 4.2mm Shank x 22.0mm LOC x 55.0mm OAL 3 Flute Uncoated Screw Machine Length Drill Bit - All Industrial Tool Supply