M18x1 + M16×1.75 mm Metric Thread Tap 6542 Steel TiCN Coat Right Hand Plug Screw
£16.15
The surface is coated with TiCN (Dark Silver Black), which has higher hardness and better wear resistance than TiN coating (Gold). It is suitable for tapping through or shallow holes in mild steels, aluminium, iron, copper, and hard plastic.
