Inlines attach to your fishing line. Mast boards attach to separate line.
I have inlines of various makes (Offshore and Church Tackle + a couple others) and sizes from the TX6 to TX44's. TX44s will pull Dypsys or up to about 1 pound weight.
Also have Riviera double, Walker double and Big Jon Otterboats for my Berts 6' dual reel planer board mast.
Bought a bunch of releases for this year and made some too(hope they work
).