Booms Fishing Line Spooler Adjustable for Varying Spool Sizes Vacuum Suction Cup: The fishing line bottom is made by a suction cup and match with a ABS model to insure this line winder doesnt shake when you transport the fishing line Ensure the Line is Tight: When you hold the line winder to a clean flat surface,that can ensure even filling with constant line tension on your reel Vacuum Pressure and Release:When you need the winder sucks the flat tightly and take down it handy,Please make good use of the trigger Aluminum Screw: The screw made by aluminum material ,which by tightening the nut is placed in the ABS model Adjusts for Varying :By adjusting the distance between the fixed screws to control the spools tightness and fit varying spool sizes