【Included Size】: The set includes three PPR lifting step drill bits, the diameters of the bits are 53/64“ (21mm), 1-1/32” (26mm) and 1-3/8“ (35mm).1/4” hexagonal handle, compatible with most power tools. 【Limit Function Design】: Contains a limit function that is not easy to punch through, which can accurately limit the drilling depth of the drill bit, preventing the drill bit from coming out of the other side of the work material, ensuring the consistency and accuracy of the hole depth. 【Industrial Grade Quality】: Made of high hardness HSS, durable and keep sharp for a long time, special surface treatment to enhance wear resistance and prolong service life. 【Efficient Hole Punching】: Tip step design, easy to cope with different diameter needs, improve operational efficiency. Reaming, drilling two-in-one, one-time molding, no need for multiple adjustments. 【Applicable Materials】：Suitable for PPR, MMP, Schedule 40 PVC Pipe, CPVC Pipe, AB5 venriation Pipe, plastic pipe and other pipe openings, fast repair and installation of fittings, saving time, whether it is home renovation or professional plumbing and electrical construction, is an indispensable and efficient tool. 【Stable Operation】: Hexagonal shank design ensures solid non-slip when drilling, enhancing operational safety, suitable for electric or hand tools, easy to operate and enhance work efficiency. 【Worry-free after-sales service, quality assurance】：We provide comprehensive after-sales service, if there is any quality problem, we promise to respond quickly and solve the problem, so that you can shop without worry. This drill tool set includes three different diameters of PPR lifting step drills, 53/64‘ (21mm), 1-1/32’ (26mm) and 1-3/8‘ (35mm), all with 1/4’ hex shanks that are compatible with most power tools. The tools feature a unique limit feature that allows precise control of drilling depth, preventing the drill from penetrating the material and ensuring consistent and accurate drilling. Manufactured from high high hardness HSS, these drills are durable and stay sharp for a long time, with a special finish that enhances wear resistance and extends service life. The stepped design of the tip allows the drill to efficiently cope with different drilling diameters, and the two-in-one reaming and drilling design improves operational efficiency by eliminating the need for multiple adjustments in a single pass. This tool is suitable for opening holes in a wide range of pipes such as PPR, MMP, #40 PVC pipe, CPVC pipe, AB5 vent pipe, plastic pipe, etc. It is an indispensable and efficient tool for both home renovation and professional plumbing and electrical construction. The hexagonal shank design ensures stability and safety when drilling, suitable for electric or hand tools, easy to operate and improve work efficiency.