Partial extension slides can travel 50% of the closed length or up to 70% with slight reduction in load. The rear of the drawer will not completely clear the cabinet. The entire range is manufactured from high grade steel type C45 E+C which ensures a slide with strong raceways, fit for the industrial purpose they were designed. Steel beams are plated with an industry standard zinc and passivate 10-12 microns surface protection. Plating is RoHS compliant. Standard ball bearings are chrome plated steel with an option to upgrade to stainless steel 304 or 316. This suits applications such as train battery boxes where solid section stainless steel slides are beyond budget.