Durable and stable: Made of quality carbon steel, it is durable and thick. Not easy to break up. 10mm steel shaft with non-slip hex drive; 8cm diameter x 30cm length. Non-slip hex drive: With its hex end, this bit provides excellent grip in chucks. Good Garden Helper: Attaches to a standard electric or cordless drill. This spiral drill bit helps you dig deep into solid garden soil, saving your effort and time. Easy to use: The tip of this twist drill bit keeps it more stable when you dig compacted soil. Variety of applications: This twist hole drill is the choice of professional landscapers for dramatically increased efficiency when planting bulbs, potted plants, vegetables, flowers, d bare root trees and shrubs, tillable soils or planters.