M3 x .5 Micro Form Tap, Semi-Bottoming DIN 371 Standard, HSS-E (Cobalt), D5/D6, TiN Coated With No Oil Grooves Type: Form Tap,Number of Flutes: 4,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. 921, Order Code 03.0000, Guhring Part #9009210030000