Black zinc chamfered hexagonal self-tapping screw drill bit

– Key Selling Points: Chamfered countersunk head + hexagonal drive, even force distribution, less prone to slippage; black zinc coating for rust prevention and aesthetic appeal

– Applicable Scenarios: Internal sheet metal of equipment, mechanical parts, black exterior connections requiring concealed anti-tampering

– Optional Materials: Carbon steel (black zinc), 410 stainless steel