Datum Dial Ammunition Measurement System Body Assembly with Screws by Forster s now carries the Datum Dial Ammunition Measurement System Body Assembly with Screws. This replacement body assembly has everything you need to attach a Cartridge Dial and keep a complete Datum Dial on hand for additional commonly used calibers. Includes the Following Components: 6-32 x ½" Socket Head Cap Screw Washer and .250 x .156 x .013 Ball Detent Body Thumbscrew Cup Point Set Screw and 6-32 x ¼" 7/64" Hex Key (Allen Wrench) 1/8" Hex Key (Allen Wrench) Note: No Cartridge Dials are Included.