This avoids the carbidedrill bits from breaking off the blades at impact.
这样就避免了硬质合金钻头在接触钻孔表面时受撞击而损毁刀锋。
2
And the main products we manufacturing are: electric hammer, electric drill, wall hole saw, metal hole saw, woodworker hole saw, cemented carbidedrill etc.
公司生产的主要产品有：电锤电钻墙璧开孔器，金属开孔器，木工开孔器，硬质合金钻头等系列。
3
Practical tests show that the performance of cemented carbide anvils, coated blade and drill bits with graded structure developed in this dissertation are superior to those with regular structure.