Craftsman Pneumatic Dual Piston Straight-Line Sander 18970 Features an impressive 42 square inch sanding Delivers 3,000 on-inch strokes per minute. Bottom exhaust and 1/4 inch air inlet /Positive action clamps hold sheets in place Uses 2-3/4" x 17" sanding sheets /Recommended operating pressure 90PSI 5CFM average air consumption /Recommended hose size 3/8"