M6 x .75 D4 Powertap Spiral Flute Semi-Bottoming DIN 374 Small Shank Tap, HSS-E (Cobalt), D4, Steam Oxide Finish Type: PowerTap,Number of Flutes: 3,Hole Type :Blind Hole 80mm Overall Length, 4.5mm Shank Diameter, Without Coolant Through, Chamfer Form C: 2 to 3 Lead Threads Series No. 5724, Order Code 006.0040. Made in Germany, Guhring Part #9057240060040