" Spiral design to dig the ground without difficultyUse a drill at low (slow) speed, drill the ground or a suitable landscape, the auger bit will start working on hard ground, easily dig a hole in a few seconds and will perform well even in rammed ground. Note: Not suitable for large rocks or solid rocks. High Quality MaterialMade of heavy duty steel, durable to use. With the glossy black painted finish, the cultivator bit is not easy to rust. Universal AccessoriesWorks well with any cordless or corded drill with a 10mm (3/8") chuck or larger (which is very common). Widely ApplicationThis spiral drill rig is 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, fertilizers, paint or mortar mixes for harsh landscapes. poles, termite bait stations, soil sampling, hole drilling. "