These pack of 4 spacers are a superior quality non genuine replacement parts that have been manufactured by Ufixt The Spacers are used to adjust the cutting height of your lawnmower. Worn down spacers are likely to become difficult to manipulate or fit and may cause your lawnmower to drop. These spacers will ensure your mower is at the correct height and can help reduce weed growths, help maintain a healthy lawn root system and help prevent runoff of fertilisers and chemicals. Locate your required grass cutting length by removing or adding the Spacers between the mowers body and the blade. It is recommended you should not mow more than one third of the total of your grass height. If you have not cut your lawn for a while and it's quite long follow the 1/3 rule and 4 days later use a lower setting to cut. Please check model fit list to ensure this part is correct for your model. Compatible with the following models: Flymo 300, 300V, 330, 350, 380 (9665049-01), 400, COMPACT 330, E300 (9633080-01), E400, E400 (9634050-01), Easi Bag, Easi Bag (9633522-01), Easi Glide 300 (966452301), Easi Glide 300V (9664524-01), Easi Glide 330 (9665550-40), Easi Glide 330XV, Easi Glide 330XV (9665551-40), Easibag (963352201) - AP0703001, Easiglide 300 (966452301), Easiglide 330VX (966555101), Glide Master 360 GM360 (9669530-01), Glide Master 380 GM380 (9669531-01), Glider 330, Glider 330 (9666187-42), Glider 350, Glider 350 (9660192-41), Hover Compact 300, Hover Compact 300 (9633031-01), Hover Compact 330, Hover Compact 330 (9633305-01), Hover Compact 350, Hover Compact 350 (9633528-01), Hover Stripe RXE300 (9633052-01), HOVERVAC 3000, HOVERVAC 4000, Hovervac H3000 (9633071-01), Hovervac H4000 (9634022-01), L300 (9630134-59), Micro Compact, Micro Compact (9633090-01), MICRO COMPACT 30 (9633090-01), MICRO COMPACT 300, Micro Compact 300 Plus, Micro Compact 300 Plus (9633096-01), Micro Lite, Micro Lite (9632801-01), Minimo, Minimo (9632506-25), Sprinter, Sprinter (9633014-