Cutting Diameter Description Series Page Length .827 - .2677 - .8622 1.98 Tap Drill/Chamfer Combo YC 508 1.26 - 2.05 CB 510 Chamfer Rings 1.00 - .500 - 2.00 Q - 2:1 518 4.00 Square Insert Indexable Drills 1.50 - .500 - 2.00 Q 3:1 520 6.00 Square Insert Indexable Drills 2.00 - .500 - 2.000 Q - 4:1 522 8.00 Square Insert Indexable Drills .500 - 1.625 2.50 - Q - 5:1 524 8.12 Square Insert Indexable Drills 4.25 - 2.125 - 3.250 6.50 Large Indexable Drills Q - 2:1 Large 525 6.38 - 2.125 - 3.250 Q - 3:1 Large 526 9.75 Large Indexable Drills 8.50 - 2.125 - 3.250 Q - 4:1 Large 527 13.00 Large Indexable Drills 4.41 - 2.125 - 3.125 QA - 2XD 530 6.25 Adjustable Cartridge Drills 479