1.Material: Carbon Steel construction with zinc plated, provides great corrosion resistance and antirust ability for long service life. 2.Advantage: Thread clear and neat, smooth without burr, force uniform, not easy to slip. 3.Applications: Good for wooden furniture jointing. Generally used in children furniture, pet furniture, Iron furniture, outdoor furniture, household furniture, stair post, wooden guardrail, solid wood furniture, custom furniture, office furniture, environmental protection furniture etc. 4.Need a pre hole before using. Specification: Product Name: Hanger Bolt; Material: Carbon Steel; Finish: Zinc Plated; Main Color: Bronze; Thread Diameter: M8; Total Length: 40mm/1.57inch; Machine Screw Thread Length: 20mm/0.79inch; Wood Screw Thread Length: 20mm/0.79inch; Package Content: 20pcs x Hanger Bolt.