Specifications:Specifications:* GPS-304C: Centeral Vacuum * GPS-304S: Self-generated Vacuum Pad Size:5",6" Max. Speed:12,000 RPM Net Weight:0.74 kgs Length:241 mm Height:86 mm Air Cons.:0.27 m3/min Air Inlet:1/4" Hose Size(ID. ):6.5 mm Sound Pressure: < 85 dBA Vibration: < 2.5 M/sec2 Air Pressure:90 psi Orbital Diameter:2.5mm,5mm,7mm Packing:8pcs/1.5cu. Ft/G:10.2kg Features: 1. Braring-Oil Leakage prevention performs longer life. 2. Unique Cylinder-Air-Inlet ensures less maintenance damage. 3. Housing Shroud totally protects housing from dust adhesion. 4. Replease Pad by simply switch the pad lock. 5.360 degree rotate + 33 degree swivel Exhaust Tube offers wide operating phase.GP, GISON