Block size: 4 by 4;Stocks this die fits: S84, SD84, 84;Threads both carbon steel and stainless steel with no die change required;Produce the most precise thread of any die;Double-threaded throats2Block size: 4-Inch by 4-Inch | Stocks this die fits: S84, SD84, 84 | Threads both carbon steel and stainless steel with no die change required | Produce the most precise thread of any die | Double-threaded throats