These zinc-plated carbon steel insert nuts provide durable threaded anchoring solutions for woodworking projects. The M4 x 10mm hex socket design allows secure installation using standard hex keys (not included), creating reinforced connection points in softwoods, hardwoods and composite materials. Each insert features rolled threads for consistent grip and corrosion-resistant zinc coating. Pre-assembled with 20 units per pack, suitable for furniture assembly, cabinet hardware mounting, and workshop applications requiring repeated disassembly. Compatible with M4 machine screws (sold separately), designed for use in pre-drilled holes matching external thread diameter.