Product description Hex lag bolts gr.2/astm a307 gr.A, hex lag screw a307 gr.A 1. Model no.: a307 gr. A 2. Material: iron 3. Raw material: carbon steel 4. Shape of head: hexagon 5. Diameter: 1/4" to 3/4" 6. Surface treatment: zinc plated, h.D.G. 7. Heat treatment: no 8. High tensile: no 9. Trademark: sd 10 .Origin: china 11. Certification: iso 12. Port: ningbo Competitive advantages 1. Top quality control 2. Competitive price 3. Various of design 4. Oem accepted 5. Customer's design and logo are welcome