4.2mm Drill bits

Timco - Ground Jobber Drills - Cobalt M35 (Size 4.2mm - 1 Each)

Rennie Tools - 4.2mm Hex Shank HSS Gold Cobalt Jobber Drill Bit For Stainless Steel, Hard Metals, Aluminium, Cast Iron, Copper

Bosch Professional HSS Twist PointTeQ Drill Bit - 4.2mm (1pc)