Usage:Cabinet Type:Kitchen Cabinet Drawer Slel Material:Cold Rolled Steel product name:Furniture cabinet drawer ball bearing rail W Length:10"-24"(250mm -600mm) Finish:Blue Zinc Black Color Zine Thickness:1.0*1.0*1.2mm Weight:62g material:cold-rolled steel size:250mm~800mm ball:2 balls 3 balls 4 balls 5 balls