GEARWRENCH 46 Inch 2 Shelf Heavy Duty Utility Cart 500 lbs Capacity Professional Plastic Rolling Service Tool Cart with 5 Inch Casters GWPSCM Grinding Discs CAT IV Safety Protection: Formally CAT IV Safety Protection: Formally rated to strict industrial CAT IV 1000V parameters to shield inspectors during high stakes diagnostics on major supply mains 800 RPM (Rotations Per Minute) Connection Spindle Thread Specification 5 8 in and apply a light drop of silicone lubricant to the swivel bearings once a month 60 lbs Material High Density Structural Plastic Caster Size 5 in Diameter Caster Material Polypropylene (PP) Color Black Warranty 2 Year Limited Warranty UPC 099575390814 Pro Tip: To ensure maximum longevity and ease of movement