Utoolmart 17.5mm Golden HSS Drill Bit Hole Saw Cutter 70mm Length For Metal Alloy Wood 1pcs

1. Put the hole opener into the electric drill before use and confirm that it is firmly clamped before it can work. 2. Keep the vertical angle to the workpiece when working. After the hole opener drills through the workpiece, the workpiece should be withdrawn while the hole opener is rotating. When working continuously, coolant or water should be used to cool the cutting edge. 3. Workers should wear corresponding protective equipment when working to protect them from working safely, and apply rust oil after use to extend the service life.