Greenlee 66PT-5/8 Nail Eater Wood Boring Bit, 5/8" x 18" Made of high quality carbon alloy steel that cuts through nails and provides up to 3 times longer life Unique patented design cutting angle provides smoother starts and reduced cutting loads Self-feeding screw point draws bit through wood even after multiple sharpening Patenteddesign for improved cutting and cleaner holes and cutting edge is hardened through for longer life