Lyman's Deluxe Anodized Aluminum Loading Blocks are made for precision reloaders who want their equipment to be as high quality as the ammunition that they produce. The blocks are CNC milled from a solid billit of 6061-T6 aluminum to tight tolerances for a close fit to specific cartridges unlike the common one-size-fits-all plastic blocks. The blocks are made in three sizes to fit most common rifle head sizes and will hold 50 rounds. Blocks come with stick-on rubber non-slip feet to keep them from sliding on your bench..485" hole size - fits: 225 Win 22-250 220 Swift 243 Win 6mm Rem 240 Wea Mag 250 Sav 257 Roberts 25-06 260 Rem 6.5x55 270 Win 7mm-08 7mm Mauser 280 Rem 300 Sav 308 Win 30-06 7.65 Arg Mauser 8mm Mauser 338 Fed 358 Win 35 Whelen.