The ECBRACKET2 ExpressCard 34mm to 54mm Stabilizer Adaptor helps prevent side-to-side movement of a 34mm ExpressCard, while the card is connected to a 54mm ExpressCard slot. The ExpressCard 34/54 stabilizer can be attached to almost any 34mm ExpressCard to provide added stability and security for your card adapter, including flush mount designed cards. The ExpressCard 34 stabilizer bracket comes in a package of three, so you won't need to swap adapters when using different EC cards. Stabilize a 34mm ExpressCard in a 54mm slot that regularly has cables plugged/unplugged from it. Stabilize a 34mm card in a 54mm slot that doesn't firmly hold 34mm cards. Stabilize a flush mount designed 34mm ExpressCard in a 54mm slot.