Product Description 3pc HSS STEP DRILL BIT SET A handy kit for any workshop, this set contains 3 x high speed steel step drill bits ranging with steps ranging from 4mm to 30mm in diameter. Comes packed in one plastic storage case. Precision ground flutes, HSS M2 bright finish Features & Specs 3 piece Steps Drill Set HSS M2 Bright Finish For drilling holes in thin material - sheet metal Ø4 - Ø12mm x 1mm steps - 6mm shank Ø6 - Ø20mm x 2mm steps - 8mm shank Ø6 - Ø30mm x 2mm steps - 10mm shank