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