Titan USA Straight Flute Tap, Standard, Series: 755, Measurement System: Metric, M18x1.5, Bottoming Chamfer, 4 Flutes, HSS, Uncoated, Right Hand Cutting, 1-13/16 in Thread Length, 4-1/32 in Overall Length, 0.542 in Shank Dia, D6 Thread Limit