Compatible with nearly all gas-powered and cordless string trimmers from top brands—including Echo, Stihl, EGO, Dewalt, Redmax, Ryobi, Cub Cadet, Weed Eater, Poulan, Milwaukee, MTD, and more. Boasting a tool-free line loading design, you can complete line replacement in just 10+ seconds. Say goodbye to the hassle of manual line winding, tedious thread-changing steps, trimmer head disassembly, and frustrating line tangles for good. Our professional after-sales and technical teams are ready to quickly resolve any product-related issues you may encounter. Please feel free to contact us if you have any questions. The package Include: 5 Nuts ( M8x1.25-6H-LH, M10x1.25-6H-LH, M10x1.0-6H-LH, 3/8-24 UNF-2B RH, 5/16-24 UNC-2B RH); 6 Bolts (M8x1.25-6G-LH, M10x1.25-6G-LH, M7x1.0-6G-LH, 5/16-18 UNC-2A RH, 5/16-18 UNC-2A LH, 1/4-20 UNC-2A RH); 1 Spacer (Outer Diameter 30 mm, Inner Diameter 10.5 mm); Washer (Inner Diameter 10.5 mm) Note: Please read the detailed description carefully and check the following information before purchasing. ? Make sure your spindle thread is counterclockwise. ? Compare the existing bolt or nut on your trimmer spindle to choose the new bolt or nut. ? Compatible Brands and Models: ECHO Speed Feed 400,SRM225,SRM200,SRM210,SRM230,SRM250,SRM265,SRM266,SRM280,SRM2100,SRM2400, SRM2450,SRM260,SRM261,SRM2601,SRM2300,SRM211,SRM2620,SRM2660,GT200,GT225,GT1100 EGO ST1500,ST1620,ST1623T,PH1400 STHIL FS50,FS51,FS60,FS61,FS65,FS80,FS96,FS52,FS44,FS66,FS86,FR106,FS74,FS74R,FE55,FS88,FR108,FS76,FS76R,FS106,FS108,FS48,FS62,FS81,FS90,FS55,FS56,FS70,FS111,FS131 Husqvarna 24R(BEFORE 1987),16R,25 (BEFORE 1987),128R,128LD,536LiRX,124L,535R RYOBI RD180K,REK285BP,RD5224,RD5225,RSB2801,RSH1100,RD3318,RD1605,RD2414,RD3818,RBC230,RBC240,RBC430,RBC330,RY30250,RBC270 Greenworks ST60L00,ST60L210,ST60B00,ST80L00,ST80L211,ST80L410,GST80320,GST80321 JONSERED GR32L,GR32LCAT,BP40COMBI,GR26D,GR26L,GR26COMBI,GT24L,GT22L,GT21L,BR400,BR450,LR300,LR200,LR220,LR260,RS38,RS44,GR44,GR41,G25RD ,GC2018,GC2026,GT2018,GT2026,GC2126,GC2128,GC2236,GC2238,GT2125,GT2128,GT2228 ARIMITSU ACC15,ACC17,ACD18,ACE30,AM24,AM24D,AM31,AM40,AM50 ALPINA CASTOR 21,25,30,34D,34F,42,42D,42F,52,52D,52F,170,180,200,210 DOLMAR BC250,LT250,BC400,SD330,PRO370,PRO400,BC337,BC377,NB26,NBO3,NBO4,NB411,NB351,BC225,LT225,MS220,MS2300,MS2600,MS3100,LT154,NBO1F,NBO2,NB16F,NB211,NBF171,NB31 GREEN MACHINE 1200,1500,1600,1700,1900,2000,2100,2200,2331,2340,2500,3000,3451,4000,4500 HONDA UH41,SXD-25HE,UMK422LTE,UMK422LT4E,UMK422UT4E ISEKI/SHINDAIWA DYB251,DYB252,DYB254,DYB261,DYB262,DYB321,BYB322,IAX180,IAX190,IAX250,IAX350,IAX400,IAX500,DYB351,DYB453,DYB354,DYB454,DYB201,DYB202,DYB231,DYB232 KOMATSU ZENOAH BC254A,BC260DUM,BC260DM,BC340DWM,BC340FW,BC431DWM,BK345FL,BK435FL,BK530DL,BC341DWH,BC432FWM,BK346FL,BK245FLK,BK436FL,BCD20,BCF01,BC431FWM,BC531DWM,BC532DWM,BK531DL,FBC22,FBC26,BC220DL,BC221DL,BC17,BC23,BC32,BC2300DC MARUNAKA T240DX/F53L,T240DX/F53,BC480DX,G13K,G3,G5,G8K,TM21DX/F3L,TM24DX/F3L,BC181DX,DBC200DX,BC240DX,BC180DX MARUYAMA BC331BK,BC402,BC480,BC184C,BC184,BC241,BC230,BC330,BC326,BC220DE,BC35,BC260,BC260H,MC260,M260S,BC200C NIKKARI SDX20,RK521,TDK518,PNB522,TXD50B,NBA524,SXD40 FK514,BC260CL,BL340DL,BC430DWM,BC440DWM,BT17,BT220 SHINDAIWA T250,C250,C27,T27,C23,C25,F20,R20,R25,T25,R35F,BP35,C35,B45,RC45,B40,RC35,B35,T230,T23E,C230,C20,LT18,LT20,T18,T20 TAS TANAKA TBC162,TBC202,TBC205,TBC215,AST7000 YAMAHA YBC20D,YBC30D,YBC40D,YBC50D 52cc 5-in-1 Multi-Tool All the above models are for reference only. Please confirm whether the bolt or nut is compatible with your spindle size before purchasing.