Acecap 25-Pack Systemic Insecticide Tree Implants for Control of Tree Pests, 3/8-Inch No chemical exposure to applicator or the environment Season-long control of tree pests, up to two seasons in evergreen trees 10 implants will treat a 14 inch diameter trunk Tools required to treat: tape measure, cordless drill with 3/8 inch bit, hammer and bolt or dowel rod Ready to install - no measuring of chemicals