規格: 直徑=22.5mm, 輪子厚度=7mm, 總厚度(含銅主體)=約10.5mm, 螺絲孔=M4牙
Specification: Diameter=22.5mm, thickness of roller=7mm, screw hole=M4 thread
材質: 塑鋼+銅
Quality: POM+brass
附M4白鐵螺絲
With M4 stainless steel screws.