Tree Root Barrier,Tree Guard,Tree grate,Tree Protector Meterial:ductile Iron Outer diameter:1000mm Inner diameter:500 Tree Root Protection,Tree Grate,Tree Guard,Tree Root Guard for tree protection.Tree Root Barrier,Tree ProtectorMaterial:Made of Ductile IronOuter diameter:1000mmInner diameter:500mmThickness:20mmCircular opening:as client designPresention:1/2,1/4Finsih:Black forge colour painted