Bularie 21" MicroCut Twin Mulching Blade Set — 2-Pack (Upper 72531-VH7 & Lower 72511-VH7), Pre-Balanced High-Carbon Steel

Bularie’s 21-inch MicroCut Twin mulching blade set (one upper 72531-VH7-000 and one lower 72511-VH7-000) replaces Honda OEM blades for precise mulching and pre-balanced operation on compatible 21" decks.

If your Honda-compatible mower is leaving uneven clippings or vibrating more than usual, this two-blade kit provides the correct dimensions and mounting hole sizes to restore factory fit and cutting geometry. The blades are manufactured from high-carbon hardened steel, pre-balanced at the factory, and coated for corrosion protection during storage — the coating will wear off on first use to reveal the cutting edge. Before purchasing, compare the provided part numbers and dimensions against your mower’s original blades to confirm compatibility.

Which mower models and OEM numbers do these blades fit?

These blades are sized and drilled to work with a range of 21" Honda-compatible decks and specific Honda model families. They are sold as an aftermarket replacement set that matches common OEM part dimensions.

• Fits Honda models such as HRX217 series, HRX537 series, HRR216 series, and select GCV160-equipped mowers.
• Replacement part numbers included: upper 72531-VH7-000; lower 72511-VH7-000 (also compatible with 72511-VL0-S00).
• Compatible with OEM Honda sets 08720-VL0-S00 and 08720-VH7-000 — verify your mower's part numbers before installing.

How are these blades built and why does pre-balancing matter?

The blades are forged from high-carbon hardened steel for toughness and edge retention. Pre-balancing reduces vibration, which helps protect the engine and mounting hardware while promoting a consistent cut pattern.

• High-carbon hardened steel resists wear and bending under regular mowing conditions.
• Factory pre-balanced to minimize engine vibration and uneven wear.
• Painted finish prevents handling corrosion; paint will abrade during first use.

What are the exact blade dimensions and installation notes?

Each blade is sized to the 21" deck specification with measured center hole diameters to match the mower spindle. Correct orientation and torque during installation are important for safe operation and optimal cutting performance.

• Upper blade (72531-VH7-000): length 20-13/16", width 2-3/5", center hole 1-3/10".
• Lower blade (72511-VH7-000): length 20-13/16", width 3-1/5", center hole 1-1/10", thickness 5/32".
• Package contains one upper and one lower blade; install cutting edges facing the ground and torque to your mower manufacturer's specification.

How simple is it to swap these blades and what safety steps should I follow?

Blade replacement is a straightforward task for anyone comfortable with basic mower maintenance, but proper precautions are necessary. Use the correct socket or torque wrench and block the blade when loosening or tightening the mounting bolt.

• Disconnect the spark plug or remove the ignition key before beginning work.
• Use a suitable wrench and follow manufacturer torque values when tightening bolts.
• Confirm cutting edges face the ground and balance visually if you notice vibration after installation.

Who is this for: This blade set suits homeowners and landscapers maintaining Honda-compatible 21" deck mowers who need OEM-sized replacements without sourcing original parts. It’s aimed at users who want durable, pre-balanced mulching blades that restore even cutting and reliable mulching performance, provided they confirm fitment by checking part numbers and dimensions first.