It consists of threaded bolt, expansion sleeve, flat washer and hex nut. Tightening the nut pulls the cone upward, forcing the split sleeve to expand tightly against the hole wall to achieve reliable anchoring. Available in carbon steel and 304/316 stainless steel. Supports zinc plating, hot-dip galvanizing. Suitable for concrete, brick and hollow block, widely used for installation of guardrails, pipelines, equipment and construction fixtures.