These are strong and durable hole saws. The sides are straight and the teeth bite well and stay straight at the beginning of the cut. There are no vibration loosening problems. Previously used on sheet metal, PVC and pressure treated poles.
Pros
β£ The heavy-duty, hardened base plate is made of thick steel for excellent concentricity, which can reduce runout and vibration, providing a smooth and accurate cut. The special spring steel body also increases strength and rigidity and minimizes vibration for very clean cuts.