The weibang wb457ab lawn aerator uses hollow tines to create cores in the soil'. '.strtoupper('l')awns can suffer from soil compaction which will starve the grass roots of essential moisture, oxygen and nutrients stunting the new growth'. '.strtoupper('u')sing a lawn aerator breaks up the old roots, improves drainage and helps to promote the new grass roots to grow.the weibang wb457ab aerator uses a briggs and stratton 750 series engine to power its 46cm working width and tines down to a depth of 7cm.the powerful briggs and stratton engine has improved torque, vibration and noise levels'. '.strtoupper('t')hey are built to be tough, reliable and efficient.specificationsmodel wb457abtype hollow tineengine briggs stratton 750 seriesdrive no, hand propelledfuel petrolengine oil 4 strokeclutch tension pulleyworking width 46cmworking depth 7cmaerator spacing 100 x 200mmwheel size front 254mm x 70mm, rear 203mm x 51mmbob weights 16 x 2sound level 102dbaweight 140kg drywarranty manufacturer's 5 year home owner subject to annual servicing 1 year commercial