Forster Bullet/Cartridge Dial #2 for 172 204 257 277 and 338 bullet diameters. Available in two models #1 and #2 May be used: Before sizing operations to find the optimal headspace for your firearm After sizing operations to check the setup and consistency of your reloading process Case and bullet/cartridge dials are interchangeable and provide quick measurement of different calibers. Specifications for Forster Bullet Cartridge Dial: Manufacturer: Forster Quantity: 1 Weight: 0.13 lb Color: Yellow Package Contents: Forster Bullet Cartridge Dial Forster DD2222: Bullet/Cartridge Dial #2 for 172 204 257 277 and 338 bullet diameters