Which bit of the sharpener should be used for the blades of a 21" lawnmower?

In the picture it would be the left end of the sharpener or the end of the extension. The very end of the extension has the sharpener for mower blades. The length of the mower blade doesn't matter (21" or 30") it should work on all mower blades. There is a set of instructions that come with the sharpener that are very helpful and explain what section to use with various blades.

I need to sharpen lawn mower blades. How many blades can it sharpen before it goes dull?

I'd say a lot. I've only sharpened the 3 blades on my garden tractor, but see no wear at all on the carbide

Does it have a case or something to store it ?in

It does not come with a case. I hang it on my pegboard in the shed.

Can I use it on a meat slicer?

Haven’t tried it for that. But worked great on all my knIves. Has to have smooth/straight edge, not jagged.

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⚡ Sharpen Like a Pro, Anywhere You Go!

MULTI ANGLE MASTERY - Three optimized slots for every blade angle—single or double bevel, knives to axes.
SAFETY MEETS COMFORT - Oversized handle and large hand guard ensure secure grip and protect your hands—even with gloves.
CONFIDENCE GUARANTEED - Backed by a 3-year warranty and 30-day money-back promise—risk-free blade perfection.
INDUSTRIAL GRADE DURABILITY - Grinding materials tested 10,000+ times to maintain shape and performance.
VERSATILE OUTDOOR ESSENTIAL - Sharpen everything from pruning shears to machetes—your all-in-one garden and outdoor tool.

The SHARPAL 103N is a rugged, multi-function sharpener featuring three precision slots, tungsten carbide and ceramic bars, and an ergonomic design for safe, comfortable use. Perfect for knives, axes, shears, and more, it delivers professional-grade sharpening durability tested over 10,000 cycles, backed by a 3-year warranty and 30-day satisfaction guarantee.

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Manufacturer	Sharpal Inc.
Model Number	103N
Package Dimensions	21.8 x 8 x 3.6 cm
Material	Tungsten Carbide Ceramic
Color	orange and black
Volume	0.1 Milliliters
Size	/
Package Weight	0.18 Kilograms
Batteries Required	No
Batteries Included	No
Material Care Instructions	Hand Wash
Brand Name	SHARPAL
Country of Origin	China
Item Weight	176 Grams

SHARPAL 103N 4 Function Knife Sharpener, Axe Sharpener, Axe Whetstone, Pruning Scissors Sharpener, Tree Sharpener, Garden Sharpener, Garden Sharpener, Outdoor Sharpener

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