Dormer F302 HSS Dienuts Metric Coarse Thread 12.0 x 1.75 Pitch DORF302M12 Dormer Dienuts are only used by hand and are hexagonal shaped for use by a spanner. Dienuts are used to reclaim damaged threads or to clean up existing threads.Metric Coarse Dienuts.Application: For reclamation of screw threads.Tolerance: 6g.Chamfer Lead: Two Threads.Surface treatment: Bright.Material: HSS - High Speed Steel.BS1127:1950Size 12mm x 1.75 DORF302M12