Manufactured From Galvanised Steel Tubing, The 50cm And 80cm Long Hoop Extension Poles Also Help Anchor The Existing Hoop Once Inserted The Recommended 30cm Into The Soil.available In 50cm And 80cm Lengthspacks For 1, 2 3 And 6 Hoops Availablemanufactured From 19mm Tubular Galvanised Steelwill Fit Our Range Of High Top Hoopsdouble Up As A Ground Anchor For Hoopsswaged So Just Slip Into Base Of Existing Hoopsrecommend 30cm Of Extension Pole Is Inserted Into Groundideal For Taller Growing Crops Such As Brussel Sprouts