Premium Materials: These hardware nails are mainly made of pure copper and stainless steel, which are sturdy and , rust proof and anti-, and have a long service life; The drill bit is made of cobalt containing high speed steel, which is to heat, wear and deformation. How to Use the Nails Set: , make pilot holes in by drill bit and stainless steel nails, then hammer the copper nails into hole, finally drive the nails out evenly around the base of the stump. Package & Size: You receive a set of tree stump removal tool, includes 12 x copper nails, 1 x stainless steel nail, 1 x cobalt drill bit nails, sufficient quantity to meet your daily use and replacement needs. The size of copper nails & stainless steel nail is 3.5in x 3.5mm, the drill bit nail size is 2.7in x3.5mm. Remove Tree Stumps and : Our copper nails disrupts tree growth by releasing excessive copper ions, helping to trees, stumps, and . Protect Surrounding Plants: Copper nails are used to remove tree stumps and without affecting surrounding plants., Weight: 0.20282528104 Pounds, Manufacturer: Prterver