Product Name : Threaded Stem Caster Wheel;Type : 360 Degree Rotation,Dual Wheel Wheel Size : 40 x 9mm / 1.6 inch x 0.35 inch(D x T);Total Size (Approx.) : 45 x 35 x 60mm / 1.77 inch x 1.38 inch x 2.36 inch(L x W x H) Threaded Stem Dia. : 6mm / 0.24 inch;Threaded Stem Length : 12mm / 0.47 inch Material : Plastic, Metal;Color : Black Weight : 46g; 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. Package Contents: 4 x Threaded Stem Caster Wheel Only the above package content, other products are not included. Note: Light shooting 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.