Sliding bolt track available in size 1 and 2, and featuring what follows: Size 1 is made from a smooth and clean profile, with hidden joints; Size 2 allows to retrofit the new track to the deck using the original bolt holes therefore there's no need to worry about the correspondence with the centre distance of the previous bores.Size 1: for boats up to 10 m, 900-kg max working load.Size 2: for boats up to 14 m, 1500-kg max working load.