The Medium/Large Spinning Reel Combo covers most skirted spinning reel spools from 1 3/4" to 3 1/2" diameters. When combined with a Super Spooler, this is the fastest, most efficient, and economical way to install Mono or Braided line onto your spinning reels. The tensioning tool on the Super Spooler allows you to apply the proper amount of tension, and by using the adapter with your cordless drill, you are installing it in the proper manor the major line manufacturers recommend.