The Topeak MTX Dual Side Frames have been designed for use with the Topeak MTX Beam Rack or the Topeak MTX EX Beam Rack to make them suitable for use with pannier bags and stop the sides of the bag from hitting your wheel. The pannier frame fits easily and securely onto the pannier rack in a matter of seconds, and is just as easy to remove if necessary.Topeak MTX Dual Side Frames SpecificationsSize: 29.4cm x 2cm x 30.4cm (L x W x H)Weight: 300gCompatible with Topeak MTX Beam Rack