The Foundation Pins™ are used to permanently secure the vapor barrier to the foundation wall. These pins are inserted into a 1/4″ hole drilled by a hammer drill. They are to be installed every two foot, two in each corner and anywhere is cut around obstructions. These pins come in packs of 100 pieces and are required for a lasting bond to the foundation wall. The heads of our pins will not break off nor will the pin come out of the hole as with other pins on the market.**Remember to figure enough pins for 1 every 2′ and 2 in each corner (one for each wall about 2″ out of the corner). It is not necessary to install Foundation Pins in concrete supports (piers).1.25 inches longInserts into a 1/4″ holeOne way spine keeps them secureLasts a lifetime+Matches all of our vapor barrier/linersMade in America