With more than a quarter century of real-world testing, Yakima&';s iconic round bar is proven across a range of adventures and under a variety of loads. Strong, utilitarian and easy to use - this classic is a classic for a reason.Bar adapter that allows you to run RoundBar on StreamLine Towers. Product Details Adapter required to use RoundBars with the New StreamLine Towers. Sold in a set of four. This product will be automatically added to the cart when you select RoundBar and StreamLine Towers in the Fit My Vehicle Tool. Includes 4 RoundBar end caps Product Specs Weight: 0.42 lbs. Dimensions: L 2.00 in x W 2.00 in x H 1.00 in