High quality materials are made from strong and durable steel to last. With a smooth black lacquer finish, the cultivator bits won't rust easily. Fast digging easily dig most types of soil, even clay and rock. Make planting work easier and faster, save your back and let the auger seeder do the work! Flower pot bulb 8cm diameter x 30cm length (3.1 Inch x 11.8 Inch) with hex non-slip drive, usable with 10 mm (3/8 in) or larger drill bits. Compatible with drill bits using 18V or more at low speed (slow), drilled directly into the ground or applicable landscape for a distance of 30 cm, then raised from the hole; For cordless drills, it is recommended to use an electric drill with a minimum voltage of 14v. Ideal for professionals and home DIY projects, planting flower bulbs, tubers, grasses and nurseries, fertilization of shrubs and trees, deep water aeration and even weeding and rooting.