【Size】1pc 1-3/16 inch(30mm) hole saw drill. The total length of the drill bit is 2-3/8 inch(60MM), blade length:3/8 inch(10mm),5/8-11 thread. Recommended RPM:6000;MAX RPM:11000. 【Excellent Finish】Diamond is dense and delicate, less debris when drilling, with smooth and perfect drilling effect. 【Not Easy to Chip】Precision diamond particles and vacuum brazing technology ensure that the drill bit is not easy to chip or damage during the drilling process, guaranteeing work safety and efficiency. 【Highly advanced technology】By adopting high-end vacuum brazing technology, the diamond and the substrate bond closely and the service life is long and reliable, which is the ideal choice for your drilling work. 【Serrated Special Bit Design】The special serrated bit design greatly improves the sharpness and drilling speed of the drill bit, and at the same time, there are multiple chip removal grooves between the serrated teeth, which can quickly discharge dust to avoid clogging and improve work efficiency.