M3 x .5 Form Tap, Solid Carbide Semi-Bottom DIN 371 Standard, D5/D6, TiCN Coated, Oil Grooves Type: Form Tap,Number of Flutes: 4,Hole Type :Blind Hole 56mm Overall Length, 3.5mm Shank Diameter, 18mm Threading Depth, With Radial Coolant Through, Chamfer Form C: 2 to 3 Lead Threads Series No. 1972, Order Code 03.0000, Guhring Part #9019720030000