HSS Threading Tool Set- Double Ended Category: Machine Tool Accessories Description Size Chart Description Used for Internal & External Threading. Manufactured in 55 and 60 degree. HSS Threading Tool Set ( Double Ended )How to measure Shank SizeShank Length6mm63mm8mm80mm10mm100mm12mm100mm Related products HSS Boring Bars Micro Fly Cutter Holder Set Fly Cutter Set Locking Device