1/4-20 Green Ring Spiral Point Plug DIN 371 Standard Tap, HSS-E (Cobalt), H4/H5, Steam Oxide Finish Type: Green Ring,Number of Flutes: 3,Hole Type :Through Hole 80mm Overall Length, 7mm Shank Diameter, 30mm Threading Depth, Without Coolant Through, Chamfer Form B: 3.5 to 5 Lead Threads Series No. 2881, Order Code 06.3500, Guhring Part #9028810063500