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Professional Countersink Drill Bit Set Meet All U Need !!! Safe & Durable Safety Conscientious Design Means No Cut Hands, No Sparks, And No Burns. Durable Material High Speed Steels, Durable And Practical, The Cutting Edge Is Hardened And Honed For Sharpness. Simple Operation Using The Lowest Speed On The Drill Bit, And Then Slightly Applying Pressure To Remove The Burr. External Chamfer Effective On Fit For Stainless Steel, Hardened Steel, Mild Steel, Copper, Brass, Aluminum, Fiberglass, Wood, Plastic. Save Your Time & Energy Simplifies The Repair Process, Eliminates The Need To Replace Expensive Or Hard-To-Find Hardware. Specification: 4X Countersink Chamfer Tool Size: 2-5mm,5-10mm, 10-15mm, 15-20mm 6X Countersink Drill Bit: 6mm(1/4''), 8mm(5/16''), 9mm(3/8''), 12mm(1/2''), 16mm(5/8''), 19mm(3/4''), 5-Flute Designed, 90°Angle All Ginode Product Are Backed By An 1-Year Limited Warranty, 100% Satisfaction Guaranteed. We'Re Committed To Offer The Good Quality Product With The Lowest Prices That Will Last For Long Time Use.