Cutting Diameter Description Series Page Length BTA Drill Brazed .315 - .570 100 x D Single Tube System BTS_SE1 638 Outer Single Start Thread BTA Drill Brazed .571 - 2.559 100 x D Single Tube System BTS_SI1 639 Inner Single Start Thread BTA Indexable Reamers .984 - 1.574 100 x D Single Tube System TBTA-R_SE4 643 Outer Four Start Thread BTA Indexable Reamers 1.575 - 3.937 100 x D Single Tube System TBTA-R_SE4-3 644 Outer Four Start Thread BTA Indexable Reamers .984 - 1.574 100 x D Single Tube System TBTA-R_SI1 645 Inner Single Start Thread BTA Indexable Reamers 1.575 - 4.370 100 x D Single Tube System TBTA-R_SI1 646 Inner Single Start Thread Head Change Reamers .571 - 2.559 100 x D Single Tube System BTA-R_SI1 650 Inner Single Start Thread Head Change Reamers .744 - 2.559 100 x D Single Tube System BTA-R_SE4 651 Outer Four Start Head Head Change Reamers .725 - 2.559 100 x D Single Tube System BTA-R_DE4 652 Outer Four Start Head .236 - .984 100 x D BTA Reamer Head - Shank System BTRS 654 486