Strong MaterialThe garden auger bit head is made of premium manganese steel and the shank is made of A3 steel, durable and not easy to deform. The surface with glossy black painted finish well protects the garden drill bits against rust High EfficiencySpiral design ensures the efficient digging and dumping of the soil without difficulty. Use a drill at low (slow) speed, then drill into the ground or suitable landscape, the auger bit easily digs a hole in seconds and works well even in the somewhat hard ground. Note: Not suitable for large rocks or solid stones Machine DecentBoth garden drill bits work great with any 3/8" or larger chuck drill. But it takes better to use drills with the power of 18V or more (For the cordless drill at least 14V) in order to have a better digging experience and save labor time 2 Various SizesThis set contains two auger bits 40 x 220mm and 80 x 300mm. They are used to quickly dig a hole of 40mm/80mm in diameter, and 220mm/300mm in depth. It helps you to plant many plants of different sizes, very useful for help you create a lovely little garden Wide ApplicationThese spiral drill bits are professional landscaper's ideal choice, well suitable for planting bulbs, potted plants, vegetables, flowers, bare root trees and shrubs, cultivate soil, and mix seeds.After using, Always keep drill bits clean for each best use Product This garden auger set is perfect for planting, seedlings, trees, shrubs, deep cultivation, concrete mixing, potting soil, irrigation trenches and more. This earth drill also makes it effortless to dig pole holes or even take it on vacation to drill a hole in the sand to anchor your parasol. It will be a good helper for you. Note : Keep the auger clean of dirt and debris when not in use.