Guhring Thread Forming Tap, Straight Standard, Series: 827, Measurement System: Metric, M4x0.5 Thread, Fine Thread Standard, Plug Chamfer, 63 mm Overall Length, 3 Flutes, Right Hand Cutting Direction, Class of Fit: ISO2/6H, 2.8 mm Shank Diameter, 3.459 to 3.599 mm Tap Drill, 2.1 mm Square, HSS-E, Bright, D3/D4 Thread Limit