Product Name : Threaded Stem Caster Wheel; Metric M8 Threaded stem, 360 rotation type, threaded stem connector, twin-wheel, brake lock, office chair caster wheel. Used widely for the furniture, hand trolley, shopping cart, appliances equipments and kinds of industrial equipments. Threaded Dia.: 8mm/ M8;Thread Part Length: 14mm / 0.55 inch Wheel Size: 5 x 1cm / 2 inch x 0.4 inch(D x T); Total Size (.): 6 x 4 x 7.5cm / 2.4 inch x 1.6 inch x 3 inch(L x W x H) Type: 360 Degree Rotation Dual Wheel with Brake; Material: Plastic, Metal; Color: Black,Silver Tone Weight: 492g; Package Content: 6 x Threaded Stem Caster Wheel Only the above package content, other products are not included. Note: Light reflection 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.