OLFA 18mm Rotary Circle Cutter (CMP-3) - Adjustable Rotary Blade Cutter w/Ratchet Handle Cuts Perfect Circles for Crafts, Sewing, Quilting, Replacement Blade: RB18-2

What It Is

The OLFA 18mm Rotary Circle Cutter (CMP-3) is a handheld crafting tool for cutting precise circles in paper, fabric, vinyl, and thin materials. It is not a lawn mower blade or mower part—it’s a rotary cutter for sewing, quilting, and crafts, with a ratchet handle and adjustable cutting radius.

Fitment & Compatibility

Before buying, confirm you need a circle cutter for crafting, not a mower blade. This tool is brand-agnostic and works with any compatible 18mm rotary blades (OLFA RB18-2). It does not attach to a lawn mower deck, spindle, or engine. Check that your material thickness is under 1/8 inch—this cutter is for light-duty use only. No deck size, OEM, or mower model fitment applies.

Key Things to Know

• Not a mower part: Despite being listed under “Mower Blades,” this is a precision craft cutter. Do not use on grass, metal, or thick materials.
• Blade replacement: Uses standard OLFA RB18-2 blades (sold separately). The ratchet handle locks the blade angle for consistent cuts.
• Installation difficulty: Trivial—insert blade, tighten screw, adjust radius with the sliding arm. No tools required beyond a screwdriver for blade changes.
• Common gotcha: The cutting capacity is limited to circles up to 22 inches in diameter. For larger circles, you need a different tool. Blade dulls quickly on abrasive materials like cardboard.

Should You Buy It

Buy if you’re a crafter, quilter, or sewer who needs repeatable, clean circle cuts in soft materials. Skip if you’re shopping for lawn mower blades—this won’t fit any mower deck or engine. For mower blade replacements, look for OEM or aftermarket blades matched to your deck size and spindle pattern.