6 Pcs Twist Drill Bit 3 4 5 6 6.5 8mm Serrated Side Saw Drill Bits for Wood PVC Plastic Board Grooving Chamfering 1[Versatile Set] Our twist drill bit set includes six pieces, with specifications of 3, 4, 5, 6, 6.5, and 8mm, catering to a wide range of drilling needs. 2[Ideal for Soft Materials] Specially designed for soft materials, this serrated drill bit set is perfect for chamfering on wood, PVC, and plastic boards. 3[Superior Durability] The spiral saw drill bit features a titanium coating, which is not prone to rusting, resistant to corrosion and has excellent anti oxidation properties. 4[Smoothly Surface] With a processed surface, the grooving drill bit is smoothly without burrs and resistant to adhesion and wear, comfortable to grip. 5[Easy to Use] The drill bit features standard round shank that makes it easy to install and use, providing users with a convenient drilling tool.