This 400mm post spike for 45-60mm wooden posts is ideal for simplifying the process of installing fence posts. With this fence post spike, there is no need to dig holes or use concrete thereby saving time when installing fencing. Once the fence post is inserted, the twin nut and bolt mechanism further secures the spike. This fence post spike is made from steel with a black powder coated finish for durability. Please note: this is designed for use in normal soil conditions. For posts greater than 60x60mm, opt for our larger 600mm model which holds fence post 65-80mm.Take a look at the Fence Fast Driving Tool which aids installation of this spike. Ideal For 50x50mm Wooden Posts To Be Used Into Soil Black Powder Coated Finish Twin Bolt Clamping Mechanism No Need To Dig Post Holes