Hiltex 10245 4"x30" Steel Gardening Auger Bit | For Planting Bedding, Bulbs, Seedlings | 3/4" Shaft Makes large planting jobs much easier and faster making it suitable for professionals and home DIY projects Features carbon steel rod for durability and alloy steel blades for maximum digging performance Digs holes up to 30 inch deep and 4 inch wide holes in all soil types while leaving dirt around the edge of dug hole for easy packing Use for planting bedding plants, bulbs, seedlings or fertilizing shrubs and trees to deep water aeration and even weed and root removal Specs: 4" auger; 3/4" shaft (can not fit 1/2" chuck); compatible with 1200W electric 1.6 HP post hole digger