Chainsaw Strimming Blower Weed Eater Adjusting Combo Torx T27 Wrench 3/4''x 5/8'' 19mm x 16mm Works For: Stihl Echo , Husqvarna, John Deere,Johsered, McCulloch ,Efco/Oleo-Mac,Poulan ,Stihl, Works on: chain saw models like the All Stihl Chainsaw bar nut. Trimmer models like Stihl FS55 FS55C FS46 FC55 FS38 Poulan models like the 25 series (new style), 1800, 2000, 2300, 3000 Dolmar models like the 109, 112, 113, 114, 116, 117, 119 & 120. Shindaiwa models like the 550, 575, 580, 680, 685, 695Honda GX25, GX35 3/4" (19mm) work on All stihl bar nut. Work on the spark plug models:BM6A L7T BPMR7A RCJ6Y RCJ7Y WSR5F,Champion CJ8, 843, Bosch WS8E 7543. Trimmer Gear box M10, M12 Thread. 5/8" (16mm) work on All stihl bar nut. Work on the spark plug models: CMR6H CMR5H NGK CMR7H CMR7A CMR6A) ( Champion RZ7C #965-1) T27 Torx Work on All Stihl chainsaw Blower, Weed eater, Strimmer,Earth Auger Etc.