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 / 1.5 inch x 0.4 inch (D*T)Total Size (Approx.) : 5 x 4 x 6.5cm / 2 inch x 1.6 inch x 2.6 inch (L*W*H)Threaded Dia. : M8 / 8mmThread Part Length : 13mm / 0.5 inch Material : Plastic, MetalColor : BlackWeight : 185gPackage Content : 12 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.