This product adopts advanced imported technique and is equipped with American pneumatic motor, Taiwan speed reducer and Japanese pneumatic components. With expected gliding damp, it is safe and reliable. This produtc is made of stainless steel and with smooth surface, reasonable design and steady property. To avoid oil-leak problem, it is furnished with pneumatic speed producer. As it has no electrical power, explosion-prevention is reasonable. This product uses loading direct-route wheel that makes agile move possible and can protect the clean area being destroyed.