7 Different Sizes CoveredHinge Drill Bit Set With All The Most Common Hinge Screw Sizes 5/64", 7/64", 9/64", 11/64", 13/64", 1/4 ", 5Mm And 1 Hex Keys. The Appropriate Size Is Clearly Printed On Each. They Are All Made Of Hss, High Hardness And Sturdy.Provide High AccuracyAutomatic Positioning Center Improves Accuracy And Efficiency. They Definitely Speed Up The Hinge Assembly Process And Eliminate The Need To Use A Punch To Make Pilot Holes. Easily Center The Screws In The Hinge Without The Protruding Screw Head Contaminating The Hinge.Reasonable Design Double-Sided Hole Design Fast And Automatic Evacuation Of Sawdust From The Hole On Both Sides, Without Blocked Drill Bit , Which Saves Your Time When Removing Sawdust.MultifunctionalThis Hinge Drill Bit Set Is Applicable For Furniture, Kitchen, Woodworking, Window Door, Etc. .1 Year WarrantyPromises 30 Days Money Back Guarantee And 1 Year Warranty. If You Are Not 100% Completely Satisfied With The Hinge Drill Bit Set, Simply Send Us A Message And We Will Issue You A Replacement Or A Full Refund.