Solid MaterialThe auger garden drill bit head is made of premium manganese steel, and the rod is made of A3 steel, durable and not easy to deform. The surface with a glossy black painted finish protects garden drill bits well from rustHigh EfficiencySpiral design ensures efficient digging and soil dumping without difficulty. Use a drill on low speed (slow), then drill the ground or a suitable landscape, the auger drill bit easily digs a hole in seconds and works well even in the somewhat hard ground. Note: Not suitable for large rocks or solid bouldersSuitable MachineThe two garden drill bits work perfectly with any 3/8 or larger chuck drill. But it is better to use drills with a power of 18V or more (For cordless drill at least 14V) in order to have a better digging experience and save the time of the work2T...