360 Rotation Type, Threaded Stem Connector, Office Chair Caster. Widely used for furniture, hand trolley, shopping cart, appliance equipment and kinds of industrial equipment. Product Name : Threaded Stem Caster. Type : 360 Degree Rotation Double Wheel. Wheel Size(each) : 40 x 10mm / 1.5 Inch x 0.4 Inch (D*T). Total Size(.) : 5 x 4 x 6.5cm / 2 Inch x 1.6 Inch x 2.6 Inch (L*W*H). Thread Diameter : M8 / 8mm Thread Part Length : 13mm/0.5 Inch . Material : Plastic, Metal. Color : Black. Weight: 185g. Package Content: 16 x Threaded Stem Caster 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 +/- 1-3 cm.