Scotty's track adaptor allows you to mount your favorite track accessories to your in?atable watercraft pre installed 341 mounts. Simply fasten the track to your 341 mount with the supplied 0.25 in-20 x 0.5 in stainless steel bolts. Slide and lock the 438 gear head adaptor or ball mount onto the track. Attach your post and ball mount accessories to the adapter and get out on the water. Please note: Only use 0.25in-20 x 0.5 in bolts when fastening the track to your 341 glue on pad. (341 glue on pad and 438 Gear head track adaptor )sold separately).