SONCHIE STONEWORK HIGH STRENGTH ECCENTERIC TWIST DRILL BIT SET: The drill tip is made of high-quality material, fully polished, clean, sharp and burr-free, which can penetrate various materials such as brick/glass/tile/plastic/wood UNIQUE DESIGN: Skewed head eccentric drill design, more stable positioning, less resistance, better rhinestone effect, hexagonal handle design, ensuring tighter drilling, safer to use Efficient and precise: head eccentric drills have precision ground drill tips, effectively preventing slippage and deflection, unique tile drilling design ensures neat and fast drilling DRILL SIZE: The skewed eccentric drill bit 6-piece drill set comes in 4 different sizes, namely 1/4 inch (6 mm), 5/16 inch (8 mm), 3/8 inch (10 mm), 1/2 inch (12 mm), various sizes are suitable for different applications to help you meet a variety of daily needs AFTER-SALES SERVICE: Each eccentric drill bit is carefully inspected before delivery. If you are not satisfied with the quality of the product, please contact us by e-mail head eccentric drill is a new type of drill bit with novel design, which is unique in adopting skewed head design and< br > eccentric structure. eccentric drill bits is made of high quality material, which is wear-resistant and has a long< br > service life and reduces the frequency of replacing the drill bit.< br > Includes four sizes 1/4 masonry drill bits、5/16masonry drill bits、3/8 masonry drill bits、1/2 masonry drill bits, < br >the drill bit set is suitable for concrete, masonry, metal and other materials, realizing the multi-purpose of one drill < br >and convenient construction.< br > skewed head eccentric drill specializes in solving various drilling problems such as deep holes, inclined holes, blind < br >holes, etc., reducing construction costs and improving project quality. Whether it is construction, decoration, < br >furniture manufacturing or machining and other industries, the crooked high hardness skewed head eccentric drill < br >can play an important role, and is one of the essential tools for construction or home personnel.