M3 x .35 Spiral Flute Semi-Bottoming DIN 371 Standard Tap, HSS-E-PM (PM Cobalt), D3/D4, TiAlN Coated Type: Grey Ring,Number of Flutes: 3,Hole Type :Blind Hole 56mm Overall Length, 3.5mm Shank Diameter, 18mm Threading Depth, Without Coolant Through, Chamfer Form C: 2 to 3 Lead Threads Series No. 2921, Order Code 03.0020, Guhring Part #9029210030020