360 rotation type, threaded stem connector, twin-wheel, office chair caster wheel.Used widely for the furniture, hand trolley, shopping cart, appliances equipments, and kinds of industrial equipments.Product Name : Threaded Stem Caster WheelType : 360 Degree Rotation Dual WheelWheel Size(Each) : 40 x 10mm / 1.5inch x 0.4inch(DxT)Total Size (Approx.) : 5 x 4 x 6.5cm / 2inch x 1.6inch x 2.6inch(LxWxH)Threaded Dia. : M8 / 8mmThread Part Length : 13mm / 0.5inchMaterial : Plastic, MetalColor : BlackWeight : 185gPackage Content : 8 x Threaded Stem Caster WheelOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.