M6 x .5 Yellow Ring Straight Flute Semi-Bottom DIN 374 Small Shank Tap, HSS-E (Cobalt), D3/D4, Bright Finish Type: Yellow Ring,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. 830, Order Code 06.0030, Guhring Part #9008300060030