... , Ceiling, etc. Yuankang Back Pack Drywall Sander 1.Product IntroductionYuankang Back Pack Drywall Sander is an updated product based on Nishi ... the promoted one- Yuankang Non-Dust Multifunctional Wall Sander occupied more human design like conveniently turning on/ ... 180mmDust Absorption Rate: 98%Main Shaft: M8 Instrument Components: Sander, Suction Machine, Dust Sucking Conduit, Dust Collecting Sleeve, ...