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 digging in compacted soil . Various applications: This twist hole drill is the choice of professional landscapers for dramatically increased efficiency when planting bulbs, potted plants, vegetables, flowers, bare root trees and shrubs, tillable soils or planters. Delivery quantity: One piece