3 Pieces in Package: The drill bit set includes 4 x 42cm heavy duty garden twist bits and 2 transplanting tools. (The longer 42cm garden twist bit saves you from bending over, no more back pain.) Durable Material: The drill bit is made of high quality manganese steel and anti-rust steel. All the internal spirals are solid, so it is durable and non-deformable. The surface of the bulb auger has a black coating that provides protection against slugs. High Efficiency: Spiral design with sharp head for easy digging of soil. It is recommended to use a 18V or higher power drill; hundreds of plant holes can be drilled in minutes. Universal Compatibility: Drill bit suitable for any drill with an 8mm or larger chuck. Also works for all electric drills with adjustable chuck. Wide Use: No more blisters or sore hands with our garden auger. Reduce the time it takes to plant a flower bed or place a fence. The garden drill bit set is a professional choice for landscapers. Great DIY tools for planting