1. #304 brushed stainless steel. 2. The thickness of the chassis, the top cover is non-standard 1.5mm, and the body is non-standard 1.2mm. The center shaft is 3.0mm. 3. Fine welding process and fine grinding process. 4. Swipe the card to open the gate and reverse the alarm. 5. The service life is more than 5 million times.