Precision machined carbon steel bits with SDS plus shank, perfect carpentry work and DIY There’re 5pc different auger drill bits, including 6mm 10mm 14mm 18mm 20mm. You can choose the most avaible wood drill for the woodworking. The self-directed thread head of wood auger drill bits can help the drill bit be accurately and quickly positioned on the wood for easy drilling. hexagonal shank design makes the hex shank won’t slip during working, perfect for hand drills and bench drills. The central solid design makes the auger bit set stable and strong during the drilling, and the wide blade slot can provide faster drilling, easier chip removal and smoother hole walls. This spiral drill set is made of extremely durable high-quality carbon steel, with .