คุณลักษณะ

• Saw tooth type demon protrusion is the same as type A, and it is the type with a brim on its head.
• The brim has the function of a flat washer, and is suitable for soft materials and for tightening by sandwiching members.
• Can also be used on the back where hands cannot be reached.
• Material is zinc alloy die cast with trivalent chromate plating (light blue color).
• Embedded nut for woodworking.
• It is used when the strength of the mating material or member to be fastened is low and the wood screw does not provide sufficient tightening strength.