HSS Steel Wood Drilling Crown 50-65mm Bimetal Hole Opener Hole Saw Drill Bit Carpentry Tool

Label:Yes Material: M42 Steel Name:hole saw Size:Diameter:50/53/55/60/63/65mm(1.97/2.09/2.17/2.36/2.48/2.56in) Package:1pc Drill Bits Color:green usage notice: 1. This hole opener has a positioning center drill, which needs to be manually installed and tightened; 2. During the drilling operation, since the center positioning drill is cut first, and after it is in place, the operation center drill will play a positioning role at the end; 3. When cutting continuously, please select a lower speed; 4. In order to prevent chipping, please do not let the edge of the hole opener collide violently with the cutting material instantly; 5. It is necessary to add water or cold cutting fluid to cool down, otherwise there is a risk of burning the drill bit; 6. When working for a long time, it is necessary to plug earplugs to reduce the impact of noise; 7. The hole opener is in a hot state after long-term operation, and care should be taken to avoid burning the skin when replacing it; 8.After use, apply anti-rust oil for longer service life.