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 Adjustable.
Chamfer Lead: Two Threads.
Surface treatment: Bright.
Material: HSS - High Speed Steel.
BS1127:1950.