Bulk Copper Stump Nails 3.5 Inch Set

Includes 23 pure copper nails (89 mm × 3.5 mm), 1 stainless steel nail (89 mm × 3.5 mm), and 1 cobalt-HSS drill bit (68 mm × 3.5 mm). Total package volume: 120 × 60 × 25 mm. Copper nails exhibit characteristic reddish-brown hue and malleable yet tensile strength (~220 MPa UTS); stainless nail shows bright silver finish and higher yield strength (~520 MPa); cobalt bit achieves Rockwell C67 hardness after heat treatment. Application follows arboricultural best practice: drill 3–5 pilot holes at 10–15 cm depth into the outer 5 cm of live sapwood, insert copper nails flush with surface, and leave undisturbed. Repeat annually if sprouting persists. Effectiveness verified on common UK species including sycamore, elder, hawthorn and cherry. Not suitable for removal of protected trees under TPOs (Tree Preservation Orders) — always confirm legal status prior to treatment. For stumps larger than 40 cm diameter, combine with radial trenching to improve ion diffusion.