Full extension concealed runner(plug-in system,bottom mounting) innerTech Model N.O:CS306 Material:Work hardened cold rolled steel/Galvanized steel Thickness:1.5/1.5/1.0mm Load capacity:45kgs/450mm Finish:Zinc Coated Size:250,270,300,350,400,450,500,550,600mm features: 1. concealed roller carriages with permanently lubricated synthetic rollers create a smooth running action 2. For 5/8" (16mm) maximum drawer thinckness 3. install easy drawer insertion and removal,For safely connecting the drawer without the aid of tools(slide-on assembly) 4. Full exension 5. with spring mechanism, self and slowly closing function 6. suitable for the drawer with shorter extension length 7. creative and optimized in designing and manufactorying,silent,smooth running