5Pcs Step Drill Bits Set Bearing Steel Titanium Hole Cutting Step Drill with Aluminum Case Woodworking Carpentry Tool Total 50 Sizes for Thin Plastic

Product Name: Step Drill Bits Set Specifications: 3/16-1/2 (58 mm), 1/8-1/2 (77 mm), 1/4-3/4 (73 mm), 3/16-7/8 (78 mm), 1/4-1-3/8 (77 mm) Groove type: straight groove Each section blade length: 5 mm/0.2 inch Application: hole expansion, drilling, deburring Material: Bearing Steel Note: 1. There may be slight differences between the picture and the actual color of the commodity. We will try our best to show you the exact color. 2. Please allow slight dimension differences due to manual measurement.

• High Hardness Material: This drill bit adopts bearing steel substrate. The cutting life is extended by 3 times. It is wear resistant, which can easily cope with thin wood, thin aluminum, thin plastic and other materials
• Double Edge Design: 118° split point tip with double edge structure, automatic correction of drilling position, greatly reducing the deviation rate, chip discharge, and burr free precision drilling
• Suitable for Opening Holes: A single drill bit integrates 10 level stepped aperture (covering Φ4-32 mm), one drill replaces the traditional drill bit set, avoiding frequent tool changes, doubling efficiency, especially suitable for opening holes and pipe expansion
• Total 50 Sizes: 5 drill bit can achieve 50 aperture specifications, covering everything from precision electronic parts to industrial grade sheet metal processing, with a classified storage box, and one step access and return
• Compatibility: No need for center punch pre positioning, direct hole opening to avoid broken blades; compatible with hand and electric drills, supporting 250-400 rpm water cooling operating