Material: High quality Zinc alloy with high hardness. These furniture screws are wear-resistant and very durable to use. Standard internal hex socket type without burr and non- design. Usage: Pre-drill /drill a well-sized hole (Suggest that the diameter of the hole is 9.6 +/- 0.2mm, the length is about 18mm), then use a 6mm internal hex tool to screw in (6mm Hex Spanner Included). Tip: If the furniture wood is with high-hardness, enlarge the screw hole. Applications:These furniture screws are suitable for furniture hardwood/ solid wood, for furniture combinations. Thread Type: M6 Length: 15mm External Diameter: 10.5mm Internal Hex:6mm Material: Zinc alloy Hex Spanner: 6mm color:Brass Package Contents: 100 x M6x15mm Screws 1 x 6mm hex spanner Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.