Easily take the hassle out of refilling your trimmer head with this FAST FEED trimmer head. Each trimmer head reloads in under 35 seconds in a just 4 easy steps, all without disassembling the head. The patented triangle eyelets deliver an even cut every time. FAST FEED/ Bump feed 4 String lines provide a greater cutting power. FeaturesFast Feed String Trimmer Head Fits Straight Shaft Weed Wackers & Loads HoldsOption to use 2 or 4 stringReload in less than 35 seconds with 4 easy stepsCompatible with Stihl (Straight shaft only)Very easy to open the trimmer headNever lose the spring while workingLonger lasting SPOOL CAPPatented eyelet design to deliver an even cut every timeBetter control of feeding lineSpecificationsWeight: 3 lbs