Supplied As A Set Of 4 The Arch Ground Sockets Come With A Driving Cap Which Makes Installation Easier. Once Installed The Arch Uprights Can Then Slide Into The Ground Sockets For Greater Stability. ground Sockets Designed To Fit Our Roman, Gothic And Ogee Garden Arches Not Suitable For Any Of Our Wire Garden Arches supplied As Set Of 4driving Cap Included For Easier Installation