Product Name: Threaded Stem Caster Wheel;Type: Rotation,Dual Wheel Wheel Size: forty x 9mm / 1" x 0"(D*T);Total Size (.): 45 x 35 x 60mm / 1" x 1" x 2"(L*W*H) Threaded Stem Dia.: 6mm / 0";Threaded Stem Length: 12mm / 0" Material: Plastic, Metal;Color: Black Weight: 46g; 360 rotation type, threaded stem connector, twin-wheel, office chair caster wheel. Used broadly for the furniture, hand trolley, browsing cart, home equipment equipments and brands of economic equipments. Package Contents: 1 x Threaded Stem Caster Wheel Only the above package content, varied item should not included. Note: Light and various displays can cause the color of the thing within the photograph a bit various from the genuine thing. The size allowed error is +/- 1-3cm.