Ideal for both professional contractors and craft enthusiasts, these drill bits cater to those who demand accuracy and reliability in their home improvement projects Engineered for excellence, the drill bit set combines industrial grade strength with user friendly functionality, ensuring every task is completed with precisions and ease These drill bits feature a unique four edges serrated design and a 1 / 4 " hexagonal shank, ensuring low resistance and efficient drilling with reduced slippage on hard materials like masonry and ceramic Perfect for a variety of applications, from home renovations to intricate craftworks, these drill bits exceling in drilling through glass, marble, and thin metal sheets, great for any toolkit unparalleled drilling precisions with Four Edges Serrated Eccentric Drill Bits, designed with fine polishing hard alloy tips for exceptionally hardness and durability across concrete, brick,, wood, and PVC surfaces, Manufacturer: ERRORY