The Niemeyer 10128 V-Belt Pulley is a genuine replacement part designed for various Niemeyer HR series tedders, including models HR 471, HR 551, HR 621, HR 701, HR 771, HR 881, HR 1001, HR 1101, HR 1251, and HR 1401. This essential component features an outer diameter of 120 mm, an inner diameter of 25 mm, and a width of 28 mm, with a 13 mm groove, ensuring proper power transmission and reliable operation in haymaking machinery.