Concentric bushing, standard head, 303 stainless steel, delivered together with W guide wheels
| 4XL | Size | |
| Standard | Head Profile | |
| Concentric (stationary) | Adjustability | |
| Inch | Unit version |
| HS | 31.75 mm | Head size |
| LO | 39.497 mm | Overall height |
| HH | 14.351 | Head thickness |
| THH | ±.001"(±0.025mm) | Tolerance head thickness |
| MV | 27.051 mm | Mounting surface to wheel vee |
| OD | 21.9710 mm | Wheel mounting diameter |
| TOD | +0/-0.001"(+0/-0.025mm) | Tolerance wheel mounting diameter |
| LB | 25.146 | Wheel mounting length |
| ID | 14.2875 mm | Mounting hole diameter |
| TID | +0.002/-0.001"(+0.051/-0.025mm) | Tolerance Mounting hole diameter |
| m | 112.8 g | Weight |
| 9/16 | Recommended mounting fasteners (Screws/Bolts) |
| BWC |
| B4XLSS B4XL |
