DCT-357 Drill Bits (Coated) 0.3/0.5/0.7mm (10 Each)Drill Bits (Coated) 0. 3 0. 5 0. 7mm (10 Each) 10 each 0. 3, 0. 5, 0. 7mm titanium coated drills. When you do a lot of scratch building and kit building, there are a few sizes of micro drill that get used all the time, and inevitably, these are the drills which are broken first! We have therefore created this exceptional value pack for the more active modeller. These drills are hard to store and easy to lose, so we have packed each size in its own