Construction typeArmDatum diameter12.7500 in, 323.85 mmMaterialCast ironNumber of grooves2.0000O.D. (in)12.7500 , 323.85 mm
| Construction type | Arm |
| Datum diameter | 12.7500 in, 323.85 mm |
| Material | Cast iron |
| Number of grooves | 2.0000 |
| O.D. (in) | 12.7500 , 323.85 mm |