Tool Selection Guide Choosing the Correct Small Hole Boring Bar Profiling minimum bore diameter(D min) high performance general performance 1 2 3 Quadralock™ A Series 4 5 6 B Series 7 8 9 10 Indexable Tooling 11 12 13 14 15 16 17 18 19 Threading minimum bore diameter(D min) high performance general performance 1 2 3 4 Quadralock™ A Series 5 6 7 8 Indexable Tooling 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Grooving minimum bore diameter(D min) high performance general performance 1 23 Quadralock™ A Series 4 5 6 7 Indexable Tooling 8 9 10 11 12 13 14 15 16 17 18 19 20 NOTE: Proper bar selection will have largest minimum bore dimension under hole size to be bored. widia.com D5