This genuine Mengele 42679 tension pulley is an original equipment manufacturer (OEM) part designed for various Mengele forage harvesters. It is specifically compatible with SF, SH, and S series models, including SF 300, SF 400, SF 500, SF 600, SF 660, SF 6000, SF 6600, SH 25, SH 30, SH 40, SH 50, SH 250, SH 300, SH 400, SH 500, SH 600, SH 660, SH 6000, SH 6600, S 25, S 30, S 40, S 50, S 250, S 300, S 400, S 500, S 600, S 660, S 6000, and S 6600. This pulley features an outer diameter of 110 mm, an inner diameter of 17 mm, and a width of 25 mm, providing reliable belt tensioning for agricultural machinery.