M4 x .7 Red Ring Spiral Flute Semi-Bottoming DIN 371 Standard Tap, HSS-E (Cobalt), D3/D4, Bright Finish Type: Red Ring,Number of Flutes: 3,Hole Type :Blind Hole 63mm Overall Length, 4.5mm Shank Diameter, 21mm Threading Depth, Without Coolant Through, Chamfer Form C: 2 to 3 Lead Threads Series No. 811, Order Code 04.0000, Guhring Part #9008110040000