M3 x .5 D3 Powertap Spiral Point Plug DIN 371 Standard Tap, HSS-E (Cobalt), D3, Steam Oxide Finish Type: PowerTap,Number of Flutes: 3,Hole Type :Through Hole 56mm Overall Length, 3.5mm Shank Diameter, 18mm Threading Depth, Without Coolant Through, Chamfer Form B: 3.5 to 5 Lead Threads Series No. 5733, Order Code 003.0000. Made in Germany, Guhring Part #9057330030000