Features:
1. This hole opener has a positioning center drill, which needs to be manually installed and tightened;
2. During the drilling, since the center positioning drill is cutting, and after it is in place, the center drill will play a positioning role at the end;
3. When cutting continuously, please select a lower ;
4. In order to prevent chipping, please do not let the cutting 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 ;
6. The operator should wear protective glasses to the eyes.
7. When working for a long time, it is necessary to earplugs to reduce the of noise;
8. The hole opener is in a hot state after long-term, and care should be taken to avoid burning the skin when replacing it;
9. After use, apply anti-rust oil for longer service life.

Specification:
Name: bimetal
Material: 2 Steel
Color:green
Size:16/18/20/22/25/28/30/35/38/45/50mm
2 steel has high toughness, high hardness, strong wear resistance and cutting ability.
Applicable equipment: handle type, hand drill, drill
It is suitable for punching a variety of materials: PVC board, plastic, wood board, gypsum board, iron sheet, aluminum alloy.

Package Contents:
1*