Panavise 311 Bench Clamp, Base Mount, USA Made, NOS. Condition is "New". Shipped with USPS Priority Mail. New and in original box. Opens to 3 1/4, Accepts 3 hole bases. Clamps to the edge of work bench or table up to 3 and 7/16" thickness. 4 Neoprene pads included for anti-slip needs. Can use with 400-300 adapter sold separately for 400 MDT base.