The al ko highline 476 spi is a top of the range electric start model with an 18 inch 46cm cutting width single speed power drive and briggs stratton instart engine the taller maxairflow steel cutting blades fitted to the highline 476 models improves grass collection and helps to prevent the discharge channel from becoming blocked the highline 476 spi self propelled mower has a 4 in 1 function which gives the user the choice between collection rear discharge side discharge and mulching