Fangrui Product Details Ingenious Slant Head Design: Our Uniquely Designed Slant Head Eccentric Drill Is For All Drilling Situations. This Innovative Drastically Reduces Construction Costs And Greatly Enhances The Quality Of Construction Work, Making It An Tool For Professional Builders And Diy Enthusiasts Alike. Exceptional Carbide Material: Our Eccentric Drill Bits Are Constructed From Premium Quality Carbide. This High-grade Material Ensures Not Only Precise Positioning During Drilling, But Also Significantly Reduces Wear And Tear, Thus Extending Tool Life And Optimizing Performance. Impressive Versatility: Our Eccentric Drill Set Is Suitable For A Wide Range Of Materials, Including Tiles, Glass, Hard Plastics, Cement, Concrete, And More. The Efficiency And Effectiveness Of These Drill Bits Are Even Further Enhanced When Used Along With A Water Drill, Providing Unmatched Results. Comprehensive Drill Bit Assortment: Our 10-piece Drill Bit Set Includes Four Distinct Sizes-1/4 Inch (6mm), 5/16 Inch (8mm)