Precise innerdiameter measurement This aperture is designed for accurately measuring the inner diameter of thinwalled parts, plastic pipes, and other cylindrical objects. Measuring range is 15–30 mm with 0.1 mm accuracy, delivering reliable results for industrial and DIY tasks. It is suitable for mechanics, engineers, and hobbyists who require dependable measurements. Universal hex shank design Standard 1/4inch hex shank fits all electric drills and impact drivers for versatile use. The quickrelease design enables fast bit changes during projects, saving time and improving workflow. Multimaterial compatibility Specially designed to drill clean holes through ceramic, granite, tile, stone, wood, plastic, and concrete walls. One set replaces multiple specialized bits for a wide range of home improvement and construction needs. Optimized drilling performance The crossshaped drill tip reduces friction and prevents bit wandering, yielding straighter, smoother holes. The flute design removes material efficiently, allowing drilling with less effort. Use scenarios Repairing thinwalled plastic piping or cylindrical components where precise innerdiameter measurement is required before cutting or fitting. Installing fixtures on ceramic tile, granite, or other hard surfaces that demand clean, accurate holes with minimal bit wandering. General DIY projects involving wood or concrete walls, where a single set of bits handles multiple materials to improve efficiency and reduce tool changes.