Used to make lidded boxes and other threaded turnings, this pair of Sorby 890H/10 Pair Thread Cutting Tools 10 TPI threading tools bring a tremendously fascinating feature to projects. The tools have a unique enhanced helix angle design specifically for use in wood, so you can be assured of smooth and precise results. The Thread Cutters come as a pair that will cut both the male and female threads. The optional Relief Tool (#19072) and Tool Support (#19074) are highly recommended accessories to help ensure the cutting of ideally formed threads. Detailed instructions are included with the Thread Cutters. HSS blades. Ash handles. England