Jonsered 20" Oregon Chain Saw Repl. Chain Model #490, 520SP, 525, 535, 590, 2050, 2051, 2055, 2063, CS 2159, CS 2159 C, CS 2159 CWH, CS 2159 WH, 2163, CS 2163, CS 2163 WH (7372) this is a 3/8" pitch ,.058 gauge chain with 72 drive links