Echo SRM-225 Operator's Manual page 13

Choosing the Correct Blade
WARNING
The type of Blade used MUST be matched to the type and size of material cut. An improper or dull blade can cause
serious personal injury. Blades MUST be sharp. Dull blades increase the chance of kick out and injury to yourself
and bystanders.
Plastic/Nylon blades may be used where ever the nylon line head
is used. DO NOT use this blade for heavy weeds or brush!
8 Tooth Weed/Grass blade (P/N 69600120331) is designed for grass,
garden debris and thick weeds. DO NOT use this blade for brush or
heavy woody growth, 19 mm (3/4 in.) diameter or larger.
80 Tooth brush blade (P/N 69500120331) is designed for cutting
brush and woody growth up to 13 mm (1/2 in.) diameter.
22 Tooth Clearing blade (99944200130) is designed for dense thickets
and saplings up to 64 mm (2-1/2 in.) diameter.
Use Shoulder/Waist harness (P/N 99944200200) Use of the Shoul-
der/Waist Harness is recommended for ALL Trimmer/Brush Cutter
use, not just Blade operation. The Shoulder/Waist Harness when used
in a trimming operation with nylon line head suspends the trimmer
from the operator's shoulder and reduces operator fatigue.
During blade operation, the same fatigue reduction is achieved. Safety
to the operator is also enhanced by reducing the possibility of blade
contact with the operator's hands and feet by restricting trimmer move-
ment.
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