The Lee Precision Factory Crimp Die lets you crimp the casing to the bullet in any location you desire without the need of a specific crimp ring on the bullet. This lets you control the cartridge overall length and maintain the highest contact patch between the bullet and the rifling.
This also gives you more control over the ignition of the cartridge and its initial travel out of the casing which can promote a more complete propellant burn and more repeatable results.
This crimp die is made for the .375 Winchester cartridge. A picture of the actual ..375 Winchester die is coming. Meanwhile, it looks exactly like the .38-55 crimp die picture.