APPLY TO - Hanger bolts are good for assembly and repairs, such as household wood furniture, outdoor furniture, office furniture and wooden guardrail, like the post of stairs, sofa legs, table legs, chair legs, etc.SPECIFICATION:Total Length: 40mm / 1.57"Flat End Thread Diameter: M6(D)Flat End Thread Length: 20mm /0.79-inPointed End Thread Diameter: 6mm /0.24"(D)QUANTITY INCLUDED - 15pcs x Double Ended ScrewsADVANTAGE - Double-ended screws are made of metal, with a zinc-plated surface to provide good corrosion and rust resistance, with long time use.INSTALL - Different thread designs at both ends, the pointed end is self-tapping wood thread, the flat end is machine thread. Provides a stable connection for connecting wood products.