Check the listing for details. Topeak Dual Side Mount for MTX Beam Style Racks. Color: Silver, Condition: New. Listed at 44.07 USD. Topeak MTX Dual Side Frame Seatpost Mount Rack attaches to Topeak MTX BeamRack series in seconds. Attaches to Topeak MTX BeamRack series in seconds. Perfect for using Topeak MTX trunk bag with panniers. Tough AL-6061 T-6 aluminum construction. Size (L x W x H): 11.6" x 0.8" x 12". Item Specifications: Color, Silver/Black, Weight, 300, Material, Aluminum, Platform Dimensions, 11.6 x 0.8 x 12", Tube Diameter, 6.4, Seatpost Diameter, 25.4-31.8, Weight Limit (lbs), 20, SHIPS TODAY! Order before 1:30PM EST, M - F, and this item ships the same day! HAVE A QUESTION?Expert customer service by bike experts! A Real Brick And Mortar Retail Bicycle Shop with people you can talk to! Contact Us! (9-5 Mon-Fri, 12-4 Sat & Sun EST) Chat With Us