316 Stainless Steel Rail No 5 only for Sliding Door System no. 5. Rail dimensions: 21 x 21 x 2 mm. 8 foot length. Please order Rollers #54.251 and End Stop #54.259 and Bracket #54.256 separately. for doors up to 33 lbs total weight using 2 carts. for different sizes track please email our offce.