Neilsen 3pc Titanium Step Cone Drill HSS Bit Set Hole Cutter 4-12 4-20 4-32mm. 3pc Large Titanium Step Cone Drill HSS Bit Set Hole Cutter 4-12 4-20 4-32mm Titanium Coated High Speed Steel Each Step is clearly Labelled with depth diameter in Steps Includes 1pc 4-12mm Drill in 2mm steps (5 steps) 1pc 4-20mm drill in 2mm Steps (9 steps) 1pc 4-32mm drill in 2mm Steps (15 steps) Also with bag to keep them in Please take a look at our other items