SAMSFX Fishing Line Spooler with Release Spring Adjustable for Varying Spool Sizes Unique spooling design, 4 sizes hole fit on 0.8"/0.5"/ 0.4"/ 0.3" thick fishing rod Pocket size for easy storage:160mm x 45mm, 6.3" x 1.7"(L x W), net weight: approx.56g Rotate the nut to adjust the spring tightness for keep the spool in tight when you adding line one your reels,handy for spooling Actual test for bellow 500 yard fishing line, accommodating width no more than 3" Made from highest quality weather resistant materials, small and compact construction fit in any tackle box