
| 
 model  | 
 Number of slots  | 
 Shaft hole  | 
 Inner hole  | 
| 
 280×4B Big head  | 
 4  | 
 55-75mm  | 
 customizable  | 
| 
 300×4B Big head  | 
 4  | 
 55-75mm  | 
 customizable  | 
| 
 320×4B Big head  | 
 4  | 
 55-75mm  | 
 customizable  | 
| 
 350×4B Big head  | 
 4  | 
 55-75mm  | 
 customizable  | 
| 
 380×4B Big head  | 
 4  | 
 55-75mm  | 
 customizable  | 
| 
 400×4B Big head  | 
 4  | 
 55-75mm  | 
 customizable  | 
| 
 450×4B Big head  | 
 4  | 
 55-75mm  | 
 customizable  | 
| 
 500×4B Big head  | 
 4  | 
 55-75mm  | 
 customizable  | 
Note: Tolerance of outer diameter: 4-4mm, support non-calibration.

| 
 model  | 
 Number of slots  | 
 Shaft hole  | 
 Inner hole  | 
| 
 280×4B Big head  | 
 4  | 
 55-75mm  | 
 customizable  | 
| 
 300×4B Big head  | 
 4  | 
 55-75mm  | 
 customizable  | 
| 
 320×4B Big head  | 
 4  | 
 55-75mm  | 
 customizable  | 
| 
 350×4B Big head  | 
 4  | 
 55-75mm  | 
 customizable  | 
| 
 380×4B Big head  | 
 4  | 
 55-75mm  | 
 customizable  | 
| 
 400×4B Big head  | 
 4  | 
 55-75mm  | 
 customizable  | 
| 
 450×4B Big head  | 
 4  | 
 55-75mm  | 
 customizable  | 
| 
 500×4B Big head  | 
 4  | 
 55-75mm  | 
 customizable  | 
Note: Tolerance of outer diameter: 4-4mm, support non-calibration.