Lawn Mower Blade Sharpener & Balancer Kit, 15°-45° Adjustable Sharpener with Red Magnetic Wall Mount Lawn Mower Blade Balancer, Compatible with Many Blade Types, Replaces 42-047 & 339075B

What It Is

This is a two-in-one lawn mower blade sharpening kit that includes an adjustable sharpener (15°–45° angle range) and a magnetic wall-mount blade balancer. It’s designed for DIY homeowners who sharpen their own mower blades instead of replacing them.

Fitment & Compatibility

• Blade types: Works with most standard walk-behind mower blades, including straight, curved, and mulching blades. Not for reel mower or rotary brush blades.
• Angle adjustment: The sharpener accepts blades with bevel angles from 15° to 45°—common for residential mowers (typically 30°–45°). Check your blade’s current bevel before adjusting.
• Balancer: The magnetic mount holds blades up to about 22 inches long and 0.25 inches thick. Larger riding mower blades may exceed this.
• Replaces: 42-047 and 339075B. If your mower uses those part numbers, this kit is a direct swap.
• No deck-size or brand restriction—compatibility depends only on blade dimensions and bevel angle, not mower brand or deck size.

Key Things to Know

• Installation difficulty: Easy. No tools required for the sharpener (just clamp it on the blade). The balancer mounts to a wall with two screws (included).
• Angle adjustment is critical: If you set the sharpener to the wrong angle, you’ll ruin the blade’s cutting efficiency. Use a protractor or the included angle guide to match your blade’s factory bevel.
• Sharpening removes metal: Each sharpening reduces blade life. Sharpen only when the edge is dull—don’t grind away more than necessary.
• Balancer accuracy: The magnetic mount is strong, but the balancer works best on a perfectly level wall surface. Slight wall tilt can give false “balanced” readings.

Should You Buy It

Buy this if you have multiple walk-behind mowers or sharpen blades often and want a dedicated, adjustable system that also balances blades. Skip it if you only sharpen once a season—a simple hand file and a screwdriver balance check will cost less.