 
          | Diameter (D) | 6.35mm (1/4") | 
| Hole size (B) | 3.17mm (1/8") | 
| Bearing thickness (P) | 2.4 mm | 
 
          | Diameter (D) | 6.35mm (1/4") | 
| Hole size (B) | 3.17mm (1/8") | 
| Bearing thickness (P) | 2.4 mm |