Draper Expert 4.2mm HSS Twist Drill Bit for 5 x 0.8 Taps by Draper Go to amazon.com Related posts Which is the best drill 4.2mm? DescriptionExpert Quality, a selection of metric-sized high speed straight shank twist drills spe;Display packed one drill per card (sizes 4;2-10;2mm) and two drills per card (sizes 1;6-3