Speed Feed 500 STRAIGHT SHAFT Trimmer Head 78890-21050 Electric Snow Blowers and Snow Throwers Also they transfer heat from

Also they transfer heat from the piston to cylinder better

The beveled chute and taller chute height

Hand tools

3 ¾'' x 4 ¾'' size opening at blade

Speed Feed 500 STRAIGHT SHAFT Trimmer Head 78890-21050 Electric Snow Blowers and Snow Throwers Also they transfer heat fromSpeed Feed 500 Shindaiwa Straight Shaft Only Trimmer Head Sku # 78890 21050 Reload in SecondsNo Disassembly Required Tired of stopping your work to struggle with complicated trimmer heads? The Speed Feed 500 is the professionals choice for efficiency. This genuine ECHO Shindaiwa part allows you to reload your trimmer line in 30 seconds or less without ever taking the head apart. Simply align the arrows, feed the line through, and twist the dial.