uxcell M5 x 0.8 Spiral Flute Tap and 4.2mm Twist Drill Bit Set, Metric Titanium Plated 6542 High Speed Steel Machine Threading Screw Thread Tap Drilling Tool - Amazon.com
4.2mm Metric M35 Cobalt Steel Extremely Heat Resistant Twist Drill Bit of 2pcs with Straight
DRILL-B-4.2) Top Hardware Jobber Drill Bits 3/16 inch (4.2 mm) – Top Hardware