1. Multiple surface treatment options available, such as color zinc plating, hot-dip galvanizing and stainless steel finish, to meet different anti-corrosion and application requirements. 2. Multi-hole sleeve structure allows the expansion segments to expand evenly while tightening the nut, providing stable stress distribution and strong, reliable anchoring force. 3. One-piece expansion anchor bolt with well-formed smooth threads for simple installation. Suitable for fastening brackets, air conditioners, guardrails and other fixtures on concrete.