Spiral design for digging the ground without difficultyUse a low speed (slow) drill, drill into the ground or suitable landscape, the auger bit will start working on hard ground, easily dig a hole in just a few seconds and will work well even in the rammed ground. Note: Not suitable for large rocks or solid rocks. High quality material Made of sturdy steel, durable to use. With the glossy black painted finish, the cultivator drill bit is not easy to rust. Universal Accessories Works well with any cordless or corded drill with a 10mm chuck (3 /8 ) or larger (which is very common). Widely Application This spiral drill is the professional landscaper's choice, simplifies drilling tasks. Great DIY tools, for planting bulbs, potted plants, vegetables, flowers, bare root trees and shrubs, for cultivating soil or planters, for mixing seeds, soil, fertilizer, paint or mortar mixes for hardscapes. posts, termite bait stations, soil sampling, hole drilling. Products include drill bits only