Specification: Material: Cast Steel Color: Black Type: 12″Auger Bit Replacement Size: 12 × 31inch; 3/4 Weight: 11.7 lbs Features: 31″ Long for each diameter，compatible with any Auger machine head with 3/4″ Shaft Durable cast steel pilot bit with tungsten carbide cutting tip Drills holes in all types of soil; the dirt removed is left around edge of hole in loose, easy-to-pack condition Exponentially increases planting speed and ease Idea for installing fence posts, decks, planting trees and shrubs Package Includes: 1 × Auger Bit .