JelBo Titanium Coated Step Drill Bit Set, HSS Hex Shank Metal Multiple Hole Step Drill Bit Kit with Impact Driver for DIY Woodworking, Metal, Plastic 3Pcs/Set

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: ? Material: Titanium coated high speed steel. ? Parameter: 3-12 mm 10 Steps (3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm) 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) ? 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