Features*100% brand new and high quality*Made of high quality materials, more durable*Replacement spool is compatible with most for Wolf GT 840 Wolf GT 850 GT-F10 from year of construction 2013*Double thread trimmer spool thread = 1.6 mm thread length 2x5m*Please compare the following dimensions:Diameter coil UPPER 64 mm Diameter coil DOWN 65.5 mmTotal height of the coil 25 mm; Diameter hole below 15 mm; Diameter top hole 13 mmPackage Contents:3*Replacement Trimmer SpoolNote:1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.2. Please allow slight manual measurement deviation for the data.