M18 x 2.5 Red Ring Spiral Point Plug DIN 376 Small Shank Tap, HSS-E (Cobalt), D6/D7, Bright Finish Type: Red Ring,Number of Flutes: 4,Hole Type :Through Hole 125mm Overall Length, 14mm Shank Diameter, Without Coolant Through, Chamfer Form B: 3.5 to 5 Lead Threads Series No. 816, Order Code 18.0000, Guhring Part #9008160180000