Amkor TREX 1000 Fast Feed String Trimmer Head Easily take the hassle out of refilling your trimmer head with the TREX 1000 FAST FEED String Trimmer Head. Each reload takes under 35 seconds using four simple steps, without disassembling the head. The patented triangle eyelet design delivers an even, consistent cut every time. Features FAST FEED/bump feed design with 4-string cutting for increased cutting power Option to use either 2 or 4 string lines Fits Stihl straight shaft trimmers Easy-open design with no disassembly required Spring stays secured during maintenance Longer-lasting spool cap for extended durability Improved control of line feed (1.5 in. to 2 in. per bump) Accepts trimmer line sizes from .060 in. to .155 in. Line Capacity Holds up to 27 ft. of .095 in. line (2-line setup) Holds up to 20 ft. of .105 in. line (2-line setup) Holds up to 10 ft. of .130 in. line (2-line setup) Holds up to 7 ft. of .155 in. line (2-line setup)