Titanium Step Drill Bit Set 🔥Features: Titanium coating, reduce friction, long service life. Suitable for plates with hardness less than 25 degrees and less than 5 mm (such as wood, iron, carbon steel plate, etc.). 🔺Specifications: ① Material: Titanium coated high speed steel. ② Parameter: 4-12 mm 5 Steps (4 mm, 6 mm, 8 mm, 10 mm, 12 mm) 4-20 mm 9 Steps (4 mm, 6 mm, 8 mm, 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, 20 mm) 4-32 mm 15 Steps (4 mm, 6 mm, 8 mm, 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, 20 mm, 22 mm, 24 mm, 26 mm, 28 mm, 30 mm, 32 mm) ③ Hex Shank: 1/4 inch quick change. 🔺Reminder: 📣 The service life of step drill bits can be prolonged by using cutting fluid. 📣 The thickness of the plate must be thinner than the gradient of the step drill bits. 📣 It can be used with the center to assist drilling. 🔥Package Included: 3 x Step drill bits