Replacement trimmer head parts number:99944200908,The product can only be rotated to the right, so it is also suitable for 99944200907b number that can be rotated left and right.compatible with Echo 400 Curved Shaft trimmer GT-225,GT-230,GT-225L,GT-225SF,Straight-shaft string trimmer SRM-26020T and SRM-2620 Trimmer head dianmeter: 3-3/4",Fits for Pas210 Pas211 Pas225 PAS Models With The Straight Shaft Trimmer Attachment. The trimmer head is made of wear-resistant ABS material, which can effectively protect the internal function from being damaged. The attached line is made of nylon material, which is not easy to break during the cutting process. Easy to install, you don't need to take the trimmer head apart to change the line, and the seat only rotates to the right Compatible With Echo Speed Feed 400 SRM140,SRM200,SRM202,SRM210,SRM220,SRM225,SRM225i,SRM225U,SRM230,SRM250,SRM251,SRM260,SRM261,SRM265,SRM266,SRM280,SRM300,SRM302,SRM303,SRM311,SRM330,SRM340,SRM343,SRM350,SRM400,SRM402,SRM500,SRM501,SRM1500,SRM1501,SRM2010,SRM2090,SRM2100,SRM2110,SRM2200,SRM2201,SRM2300,SRM2301,SRM2400,SRM2410,SRM2450,SRM2500,SRM2501,SRM2502,SRM2510,SRM2530,SRM2601,SRM3000,SRM3001,SRM3010,SRM3100,SRM3110,SRM3400,SRM3410,SRM3500,SRM3550,SRM3800,SRM4600 Weed Eater