INCLUDES - 4 x brake swivel stem casters come with 4 x threaded insert nuts 5/16"-18 x20mm length screw in nut and 4 x English unit 5/16"-18 Hexagon Flange Nut. | SIZE - Mounting Height 3",Stem Length : 1" or 25mm; diameter: 5/16" or 8mm, Wheel Diameter : 2" or 50mm.Measure thread by Gauge before buying to avoid wrong buying. Gauge Assin:B07B8TH62D | DUAL LOCKING - The stem and the Wheel both will be fixed if the brake is pushed down | MATERIALS- Polyurethane Rubber Wheel, - Carbon Steel Frame, Maximum Total Load Capacity: 330 lbs per 3pcs (Counting 3 PCS when using) | WARRANTY - Free new casters or full refund against defect photo within 3 years. Please measure the size you need before buying.