The PEXP1-SX is a wearout extender, designed to go on top of the PCI Express Bus Isolation or other extenders. These are short and low cost extenders with heavy duty connectors of 2000 - 3000 insertion cycles. Their purpose is to prolong the life of other connector contacts or gold fingers in heavily used environments. All the wearout extenders have the same height, at 1.05", and the width is 1.72".