Heavy Duty Drain: Kit includes bottom rail and upper grating, bottom trench is made of SMC resin material which is durable and unbreakable, upper grating is made of stainless steel. Durability ensures permanent collection and dispersion of standing water. INTERNAL EXTERNAL DRAINAGE: The Compact Trench Drainage System is ideal for draining low water flow areas inside and outside the home. It is also suitable for a wide range of locations such as gardens, swimming pools, sports fields, patios, footpaths and driveways. Cut to size: If the size doesn't fit, you can use a tool to cut it to the shape you want. EASY TO INSTALL: Firstly, you need to dig a channel in the soil or concrete, then smear the soil, put in the channel, cover the grille, and you are done. Note: The width of the trough should be more than 4cm wider than the width of the channel. Size: One channel is 100cm long, if you need a longer channel you will need to buy two or more. Please note: Each channel needs to be glued in place.