This fine selection of hand tools from Lyman performs the three most important steps in achieving a clean, uniform primer pocket and flash hole in preparation for seating a new primer. Each tool features an unbreakable, comfortable, cushioned, ergonomic polyurethane handle. Primer Pocket Uniformer cuts the primer pocket to a uniform depth so seating depth for all primers is the same to ensure uniform ignition through an entire batch of reloaded ammo. Collar is locked to a pre-set depth that conforms to SAAMI specifications.
Big Book Catalog, Issue:66, Page:510
Sinclair, Issue:4A, Page:005