Dormer circular split dies can be used by hand or machine. Because the die has a split it can be adjusted slightly to provide a thread slightly smaller or larger than the norm.Metric Coarse Adjustable Dies.Application: For Production of components less than three times diameter in length.Tolerance : 6g AdjustableChamfer Lead : Two ThreadsSurface treatment : BrightMaterial : HSS - High Speed SteelBS1127:1950