Material: High high quality Zinc alloy with high hardness. These furniture screws are wear-resistant and very durable to use. Standard inner hex socket form without burr and non-slip design.Usage: Pre-drill /drill a well-sized hole (Suggest that the diameter of the outlet is 9.6 +/- 0.2mm, the size is set 18mm), then use a 6mm inner hex device to screw in (6mm Hex Spanner Included). Tip: If the furniture wood is with high-hardness, please expand the screw hole.Applications:These furniture screws are compatible for furnishings hardwood/ strong wood, for furniture combinations.Thread Type: M6Total Length: 15mmExternal Diameter: 10.5mmInternal Hex:6mmMaterial: Zinc alloyHex Spanner: 6mmcolor:BrassPackage Contents:100 x M6x15mm Screws1 x 6mm hex spannerOnly the above package content, other products aren't included.Note: Light taking pictures and diversified reveals may cause the colour of the object in the photograph a bit various from the real thing. The measurement allowed error is +/- 1-3cm.