M12 x 80mm Ring Lifting Expansion Eyebolt Bolt Screw with 304 Stainless Steel Anchor Bolt
- ...sing percussion drills to punch holes, they must be punched vertically, and the hole diameter cannot be too large, otherwise the tightness will be affected. 2. When it is installed upside down on the roof, it must be installed on a solid material. It is not suitable to install overweight objects, nor can it install machines with large vibrations, because there is a risk of falling due to vibration and overweight..