1. sprocket gravity roller 2. taper roller 3. drive roller/non-drive roller 4. in steel, ... or stainless steel 5. in grey GCS Sprocket gravity roller, taper roller, pvc rollerRoller Dia (mm)Roller SpecRemark25, 38, 50, 57 ... info.Further check www.rkm.cn GCS drive/non-drive taper sprocket gravity roller