Description: The wall hole drill bit is suitable for engineering installation, air conditioning installation, wall drilling, etc. Features: 1. Wall cutters control dust and debris in clean workspaces.2. The cutter sealing buckle design ensures that dust does not leak.3. Bowl-shaped, the wall hole drill bit makes it easy to use and has a larger capacity. Specifications: Material: Silicone Size:Small: About 125*90*90mm/4.92*3.54*3.54in Large: About 160*90*90mm/6.29*3.54*3.54in Aperture: About 18mm/0.70in Weight: About 110/130 gramsPacking List:1*Dust Cover1*SpringNotes: Due to the lighting effects and shooting angles, there is color difference in the product, please understand. Due to manual measurement, there is a tolerance in the size of the product.