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3Pcs High Speed Steel Titanium Coated Step Drill Bit Set (100% New, High Quality) Features: 1. Material: High-speed titanium steel coating, titanium alloy coating to reduce friction, long life. 2. Design: This is a dual-slot design that increases cutting speed and automatically prevents centering, preventing chip walks and smoother removal. Handle: 1/4" quick change hex handle. 3. Widely used: hexagonal shank titanium alloy drill for a variety of materials, steel, aluminum, copper, stainless steel, plastic boxes and chassis work.(applicable to hardness below 25 degrees, such as carbon steel, step board thickness of 5mm) 4. The main use of size: 3-12mm (3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm);4-12mm (4mm, 6mm, 8mm, 10mm, 12mm);4-20mm (4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm). 5.Package: 3 x Hss Step Cone High Speed Drill Kit. About us: 1. High-performance Products In our shop, we promise to provide you with high quality products at favorable prices. 2. Efficient Logistics Speed Professional FBA allocation greatly reduces your waiting time and risk of packet loss. 3. Professional Services In our shop, if you have any questions about our products, we will provide you with professional, intimate sales service. 4. Product Guarantee Provide you with two years of 365 days of product guarantees, throughout the year to provide you with quality product protection.