Applications: Suitable for electric hammers, electric picks, impact drills, hand drills, etc. Double layer: Dust-proof double layer design, which perfectly collects dust without spreading outwards, and effectively prevents the diffusion of dust and inhalation into the lungs. Simple and quick application: can be attached quickly and easily for more convenience. Bearing design: When used on the side wall or when drilling holes in the ceiling, the bearing design prevents heat and wear. Use: Especially suitable for ash when drilling the side wall and ceiling. Note: The data is all measured manually, please allow 1-3 cm error due to light and display differences, there may be some color differences, please refer to the actual item received.