Features:1. one hundred pc fresh level adjustment caster with excessive quality.2. Low beginning and rolling resistance, roll quietly and smoothly.3. The wheel has nice wear resistance, does not scratch the floor.4. Made of excessive energy material, with nice bearing capacity and durability.5. Industrial caster, appropriate for heavy obligation equipmentSpecification:Material: MC Nylon + MetalQuantity: 4PcsProduct Size: 8*6*7.5cm / 3.15*2.36*2.95inLoad Bearing Weight: 50kg/1pcs, 100kg/4pcs.Applications: machine communique equipments, semiconductor equipments, medical machineries, computer supports, furniture, electric automation equipments, aluminum frames.Note:1. Move: loosen the knob by means of hand, and regulate the foor seat, then move.(In case of difficulty for load utility or rotation, use a wrench to loosen it.)2. Fastening: fasten nut with a wrench and amplify the adjustment seat for fixingPackage List:4 * CastersNote:1. Please allow slight error because of handbook measurement. Thanks for your understanding.2. Monitors aren't calibrated same, merchandise coloration displayed in images could also be showing slightly various from the genuine object. Please take the real one as standard.