Adjustable Width Cross braces fit under mattress. To suit single, double, & 3/4 sized beds. Chrome plated steel rails. Telescopic rails. Spring loaded buttons on clamps. Gaps of 10.2 cm (4inch) between rails. Hard wearing. Rails are very secure. Satisfies medical device requirements. Easy to adjust. Length can be adjusted to fit various sized beds. 3 bar side rails. Width Adjustment 91.5cm (36inch) to 157.5cm (60inch). Maximum Height from base section 43cm (17inch). Length Adjustment 122cm (48inch) to 193cm (76inch). Gap Between Rails 10.2cm (4inch).