- Patent Trim Magic Spiral Head provides a concealed finished appearance, without burrs.
- U Thread enlarges hole for countersunk head and reduces splitting.
- Patent Twister Thread low driving torque and high holding power, also reduces the wood split even close to the edge.
- Type 17 Sharp Point helps remove wood clips when drilling, reduces torsion
- Can be Stainless steel with high protection against corrosion for outdoor.