The Goldblatt Dust-Free Sander virtually takes the mess out of drywall sanding. Designed to be attached to a standard shop-vacuum, this handy tool eliminates up to 90-percent of dust associated with traditional drywall sanding methods. It has adjustable air-flow for variable vacuum force. 360 pivoting elbow for ease of use on vertical surfaces. The change knobs are spring loaded for quick and easy sand screen changes. The knob is low profile and stays out of the way. Lightweight design with soft ergonomic grip. Compatibility with most shop-type vacuums. Works with most standard die-cut sand screen paper. The pad dimension: 9-1/4" x 3-1/4". Includes: 6-ft hose, coupler, adapter and one sanding screen sheet.