[6Φ×13mm Drive A-type]
[6Φ×15.5mm Push B type]
[5Φ×13mm Threaded E Type]
[8Φ12.5mm Slotted J Type]
[5Φ×13mm Threaded D Type]
[6Φ×10mm Drive A-type]
Dedicated to mounting adjuster casters and protrusions around the outer circumference prevent it from moving around.