| Standard Diameter | Length scope ( mm) | Bearings Type (Min~Max) | Idler's Shell Wall Thickness | |
| mm | Inch | |||
| 63.5 | 2 1/2 | 150~3500 | 204 | 3.0mm~3.75mm |
| 76 | 3 | 150~3500 | 204 205 | 3.0mm~4.0mm |
| 89 | 3 1/3 | 150~3500 | 204 205 | 3.0mm~4.0mm |
| 102 | 4 | 150~3500 | 204 205 305 | 3.5mm~4.0mm |
| 108 | 4 1/4 | 150~3500 | 204 205 305 306 | 3.5mm~4.0mm |
| 114 | 4 1/2 | 150~3500 | 205 206 305 306 | 3.5mm~4.5mm |
| 127 | 5 | 150~3500 | 204 205 305 306 | 3.5mm~4.5mm |
| 133 | 5 1/4 | 150~3500 | 205 206 207 305 306 | 3.5mm~4.5mm |
| 140 | 5 1/2 | 150~3500 | 205 206 207 305 306 | 3.5mm~4.5mm |
| 152 | 6 | 150~3500 | 205 206 207 305 306 307 308 | 4.0mm~4.5mm |
| 159 | 6 1/4 | 150~3500 | 205 206 207 305 306 307 308 | 4.0mm~4.5mm |
| 165 | 6 1/2 | 150~3500 | 207 305 306 307 308 | 4.5mm~6.0mm |
| 177.8 | 7 | 150~3500 | 207 306 307 308 309 | 4.5mm~6.0mm |
| 190.7 | 7 1/2 | 150~3500 | 207 306 307 308 309 | 4.5mm~6.0mm |
| 194 | 7 5/8 | 150~3500 | 207 307 308 309 310 | 4.5mm~6.0mm |
| 219 | 8 5/8 | 150~3500 | 308 309 310 | 4.5mm~6.0mm |