Gardman 20m Ultra Heavy Duty Tough 3.5mm Garden Wire Gardman 20m roll of ultra heavy duty garden tying wire. PVC coated with an extremely strong metal wire core (3.5mm wire & protective coating). FREE POSTAGE £6.95 Quantity: at £6.95 each Add To Basket Gardman 3.5mm thick heavy duty garden wire is ideal where you need extra strength for a range of gardening uses. This 3.5mm diameter metal wire (metal core and plastic coating) is extremely strong and suitable for plant training, fence support, fruit cages and frames. Each roll contains 20m of garden wire. PVC covered to make it rot-proof and long lasting.