The Topeak Backloader Wishbone is an anti-sway saddle mount that holds a rear saddle bag rigid and in place helping to keep you balanced on your bike adventures. Made of aluminium alloy and stainless steel, stout and durable. The twin bars can hold two additional bottle cages for extra hydration needs.Material: Aluminium alloy / Stainless steel / Engineering grade polymer MAX LOAD: 2 kg / 4.4 lb MOUNT Saddle rail Compatibility: Topeak Backloader Rear bag width less than 18 cm / 7.1  Added Features: Two additional bottle cage mounts and water bottle cage bolts included Size: 16.3x14.7x14.2cm / 6.4 x5.8 x5.6  Weight: 190g / 6.70oz