Topeak Mount Bottle Cage ExtenderFeatures Constructed from CNC machined aluminum for strength and low weight. Provides 43 mm of vertical offset to raise or lower your bottle cage Allows repositioning of bottle cages on small frames, compact or full suspension bikes for better access. Easy to mount using standard bottle boss bolts Durable finish and build quality, designed to withstand regular use Specification Mount Water bottle boss mount Material CNC Aluminum Size 13 x 1. 3 x 1 cm