Prime-Line M 6151 Rullo in nylon per porte doccia scorrevoli, 3/4 pollici, 4 pezzi -
"3/4"" Tub and shower door nylon ball bearing roller with an oval edged wheel. It has a threaded hex head hub that uses an 8-32 x 3/8 in. Used on a variety of different tub and shower top roller systems.