Clayton 670-12501J 5-Inch Pneumatic Random Orbital Sander with Multi-Hole Pad 12,000 RPM 0.24 HP Motor provides plenty of power Swivel connector allows attachment to 1" vacuum hose Fully pneumatic (air powered) operation, 1/4 NPT air inlet Ergonomic wrist support Accepts backup pads with 5/16" threaded center stud