Package Contains: 12 x black rigid caster wheels with mounting screws, 1 x screwdriver | Overall Dimensions: 42 x 19 x 29mm / 1.65" x 0.75" x 1.14"(length * width * height). The maximum load per wheel is 5kg / 11lbs | Wheel Size: 25 x 13mm / 1" x 0.5" (D * T); Mounting Hole Diameter: 4mm / 0.16" | Widely Used: This caster wheels are suitable for small machinery, trolleys, furniture and racks | 100% Risk-Free Shopping: If you are not satisfied with any ZXHAO products, we have nothing to ask and let you enjoy a full refund. Because we want our customers to enjoy a 100% satisfied shopping experience.