Spiral Design for Digging Soil without DifficultyUse a drill on low (slow) speed, drill into soil or applicable landscape, auger drill bit will start working on hard ground, easy to dig a hole in a few seconds, work well even in the rammed soil. Note: not suitable for large or solid rock. High Quality Material Made of heavy duty steel, durable to use. With glossy black painted finish, make the cultivator drill bit not easy to rust. Universal Accessories Work well with any cordless or corded drill with a 10mm (3/8") or larger chuck size (which is very common). Widely Application This spiral hole drill is the professional landscapers' choice, Simplifies drilling tasks. Great DIY tools for planting bulbs, potted plants, vegetables, flowers, bare root trees and shrubs, tilling soil or planter boxes, mixing seed, soil, fertilizer, paint, or batches of mortar mix for hardscapes, save your time during planting umbrellas or posts, termite bait stations, taking soil samples, boring plant holes or erecting fences. 30 Days Satisfaction GuaranteeWe are always ready to provide professional suggestion for our customers within 24 hours.