The Yak Attack Screwball 1.0 in. Ball with MightyBolts is compatible with the Wilderness Systems SlideTrax Accessory System as well as other track systems.
The screwball mount with mighty bolts works great with tehGT90 Track system. Also tried the cell blok battery system but found the total weight to cause the Kayak to list. and opted for the track screwball to do the job much better.
Pretty cheap...will split open if you barely over tighten the least little but. Its too loose if you dpon't. I am on #3 now and won't buy another.
Works great if you need a 1" ball and you want to move things around on a track.
Extremely tight fit and excellent quality. This ball has held up to a lot of abuse in the past several weeks, and still looks new.