a strength-to-weight ratio of 4.17 drilling can be acwe do successful co times that ... comparable nickel size #61 039 er bit 118° point silver ferrules only 0.165 ... currently available in size 13/64 ti-bit $15.95 whole sets tpf-13-ws $74.95 half ... step down replica ferrules etc skirt water seal welt water seal shoulder inside ... diameter i.d water seal welt tabs serrations shoulder ... male slide shoulder male slide water seal nominal ferrule size for the step- ...