Fits our R10231, R10638 & R10639 Trimmer Heads
5/16-18 Left hand nut

Replaces Echo 157410
Used on old style Tap-N-Go head with foam rings.

Nut for Stihl weed trimmers & brush cutters for mounting blades or heads.
10 mm x 1.0mm left hand threads

Fits our R10231, R10638 & R10639 Trimmer Heads

Reduces the wear & extend the life of the trimmer line.
Also helps reduce line weld.

Replaces Lawn Boy 153066, 682069, Ryan/Ryobi 153066

Fits Homelite EZ Line Advance Systems with right hand threads. (black)

Replaces Homelite A97910A, 308042003
Fits Homelite EZ Line Advance Systems with left hand threads. (red)

Replaces Echo 215705, Shindaiwa 72005-92660, Stihl 0000 997 2300
Fits compact twist feed and heavy-duty twist feed trimmer heads

Fits our R10231, R10638 & R10639 Trimmer Heads

Fits our R10231, R10638 & R10639 Trimmer Heads
Outer drive has 4 pins