3 Piece ThunderMAX Step Drill Set 2x Life Sizes: 4 - 12mm, 4 - 20mm, 6 - 30mm Ideal for: non-ferrous metals, sheet metals, plastic & stainless steel Suits: Power drill and Impact driver Drills & deburrs in one process Self-starting split point removes the need for a pilot hole Tempered black finish maximises lubricant hold, therefore assisting chip flow & heat dissipation Made in UK Corrosion resistant finish TUFFBOX PRO | ALPHA’S LATEST INNOVATION Strong hinges allow tool bits to stand whilst working Compact case for easy transportation & sustainability Sturdy latch to secure contents on the worksite Bold coloured case for easy location More drill ranges available in convenient sets Colour-coded cases for easy differentiating between metric & imperial Colour-coded latches to distinguish between different series Eco-friendly & reusable packaging & retail merchandising options