car jack jack hydraulic type floor jacktrolley jack 1.Heavy-duty,steel construction provides safe use and long-term durability 2.Two swiveling rear castors 3.Large saddle to aid positioning under the vehicle 4.Lifting range:135-326mm 5.Built in relief valve prevents overloading 6.Product size:450×204×135mm 7.Package size Colour box:470×215×145mm Blow case :470×230×150mm 8.Quantity/20'GP 2050PCS(colour box)/1900PCS(blow case)