1. Passed CE 2.Back Pack 3.Environmental friendly sander 4. dust-absorption rate 98% 5. ... , Metal, Wood, Plywood, Ceiling, etc. Yuankang Back Pack Drywall Sander 1.Product IntroductionYuankang Back Pack Drywall Sander is an updated product based ... of our products. With sound business credit, excellent after-sales service, and modern manufacturing facilities, we have earned an excellent reputation ...