Sleeve anchors: Feature: (1) High strength (2) Anti-corrosion (3) Environmental protection (4) Heavy-duty and so on . Material: steel, zinc plated. Stainless steel.Different type of head is available as required.Pre-assembled for quick and easy installation, can be used in thin sections of concrete or solid masonry.Can be applied to steel structure, track, metal template, bracket, railing, door, ...