1.Diameter: Garden auger bit 40 mm and 80 mm. 2. Made of sturdy steel for durability. With a glossy black paint finish, the cultivator bit is not easy to rust. 3. Ideal for: Potted plants, vegetables, flowers, bare root trees and shrubs, cultivated soil or planting boxes, mixed seeds, soil, fertilizer, paint or mortar mix for difficult landscapes Dig holes or ice holes. 4. Save time and energy. Use in any electric or cordless drill that can accommodate a 3/8 "" bit. No better tool for digging holes in your yard. If you grow onions, potted plants, vegetables, flowers, bare trees and shrubs, or use plant soil or flower beds, mixed seeds, fertilizers, our twist drills are the best choice for improving efficiency. It is also suitable for landscapes with hard mortar mixtures. Our drills can also easily dig holes in the sand, or even drill holes in the sand to attach an umbrella when you are on vacation, which is of great help to you. It can prevent bending when drilling, and even drill through loose stones, so you can plant bulbs and cushion plants where you need them.