The Brabantia metal Soil Spear is designed to be installed straight into your lawn for immediate use. It comes in various sizes designed to fit various Brabantia Rotaries and provides solid anchoring without concreteSpoil Spear FeaturesBrabantiaMetal soil spearWith handy closure cap- anchor stays clean e.g. when mowing the lawnSolid anchoring without concreteMade of galvanised steel plateAvailable in 3 diameters: 35mm, 45mm, 50mm2 Year GuaranteeCompatibility:35mm diameter- Rotary Essential45mm diameter- Rotary Lift-O-Matic & Rotary Topspinner50mm diameter- Rotary Lift-O-Matic AdvanceWhat size do I need? There are three options to determine which size ground spike is needed. Q. Do you know the original ground spike cap cover colour? A. Black Cap = 35mm Red Cap = 45mm Yellow Cap = 50mm Q. What is the inner width measurement of the original ground spike? A. Measured in mm\'s you need to identify what width rotary airer you own. Q. What is the width of the stem measurement of your rotary airer? A. Please note: Exact size ground spike is needed for correct fitting.Brabantia\'s Ref.MPN: Soil SpearColour: Steel PlateSizes: 35mm, 45mm, 50mmPM Ref. 700231