Weed Wacker Attachments, String Trimmer Head Blades Replacement, 20pcs Steel Wire Cutter Blades Lawn Mower Weed Trimmer Blades Accessory for Cordless Grass Trimmer

What It Is

This is a set of 20 steel wire cutter blades that replace the string on a weed wacker/string trimmer head. They’re designed for heavy-duty clearing of thick weeds, brush, and saplings where standard nylon line snaps or wears too fast.

Fitment & Compatibility

• Not universal – these blades replace the cutting line in a trimmer head, but only fit heads designed for blade attachments (usually with a center hole and retaining nut). Do not use in standard bump-feed or fixed-line heads.
• Check shaft type – most cordless trimmers use a straight shaft with a compatible head; curved-shaft models often lack the torque or head design for blades.
• Measure the blade – each blade is roughly 1.5” long; confirm your trimmer head’s cutting swath and clearance. Blades that are too long can overload the motor.
• Brand/model specifics – works with many cordless trimmers (e.g., Ryobi 40V, Greenworks, Kobalt 80V) that accept universal blade attachments. Check your owner’s manual for “blade-ready” head or aftermarket adapter compatibility.
• OEM vs aftermarket – these are generic aftermarket blades. Quality and fit can vary; if your trimmer has a proprietary head design (e.g., Echo Speed-Feed), these won’t work without an adapter.

Key Things to Know

• Steel vs nylon – steel blades cut woody stems and tough brush far better, but they’re dangerous near hard surfaces (concrete, fences) and can throw debris violently. Always wear eye and leg protection.
• Installation – moderately easy: remove the old line/spool, thread the blades through the head’s slots (usually 2-4 blades per slot), and secure with the retaining nut. Some heads require a special wrench.
• Motor strain – steel blades create more drag than string. On cordless trimmers, this drains battery faster and can overheat the motor if you run at full throttle in heavy growth. Use in short bursts.
• Common gotcha – blades can bend or break on rocks or metal edging. The 20-pack gives spares, but expect to replace them more often than nylon line in clean grass.

Should You Buy It

Buy this if you regularly clear dense brush, brambles, or saplings with a cordless trimmer that has a blade-compatible head, and you want a cheap, disposable solution to avoid buying expensive branded blades. Skip it if you mostly trim grass along edges or around flower beds—nylon line is safer and kinder to plants and fences.