Click beetles have a flat, elongated-shaped body, often with a tapered abdomen, and grow to about 8 to 10 mm in length.
Wireworms get their name from their long and thin (wire-like) shape. They are yellow to yellow brown in colour, and have a hard external shell, and a distinct, dark brown head. Wireworms typically grow from less than 2 mm to 2.5–3 cm. The abdominal segment is usually pointed (genus Agriotes), or – less commonly – darker in colour, with a caudal notch (genus Agrypnus, Selatosomus). Wireworms typically burrow into potato tubers, making tunnels, often with suberised surfaces, up to 3 mm in diameter, with clean entry holes. Bore holes made by wireworms can also be seen in beets and thick plant roots. The larvae operate within a radius of about 6 m.