... for cargo trailers, auto sporters, business trailers, and other special trucks. Detailed Product Description Metal Stamping ... gears, crossed helical gears, worm gears, rack and pinion. Laser Cutting:provided rapid precision laser cutting ... Treatment:Include quenching,High-frequency hardening,quenched and tempered,tempering,carburizing,nitriding,carbonitriding and so on. Surface Treatment:Include ...