So, how are these wedges placed in their respective hole? Does one have to place it so the "split" follows the desired line? Alignment/mechanism?

Yes. Figure out how you want the split to run and then place your wedges so it splits the rock in that direction as the wedges push apart the feathers. Two things I learned: Make your holes 5/8", not 3/4". I tried 3/4" holes and it didn't work as well. Also make sure you drill your holes deep enough. It's a bummer if your wedges bottom out in the hole before the split begins. Other than that, it's amazing ancient technology at work.

How deep of a hole do you drill? The description says 1.5” but this seems very shallow considering the shim is 4.5” long.

The shoulders of the outer shims sit near the top of the hole and there has to be room for the wedge to go right through without bottoming out. Looking at the dimensions in the diagram about 4" minimum depth. If the wedge does hit the bottom it can be extracted by drilling a second hole alongside but it's best to avoid that. The description also says a hole 0.5" diameter and that's wrong too.

Some of the shims have bent at the narrow place and then broken off. How does one get replacements?

Buy more, there’re cheap👍🏼👍🏼

Wedge is approximately 4-1/4" long.

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🪓 Split with precision, power, and style — be the craftsman everyone envies!

LIGHTWEIGHT PORTABLE - Easy to carry and use on-site, making you the go-to pro for any stone splitting job.
ERGONOMIC RUBBER HANDLE - Comfort grip ensures safety and control during intense manual work sessions.
PRECISION 5 8 INCH SIZE - Perfectly engineered for controlled, accurate splitting every time.
VERSATILE STONE SPLITTING - Effortlessly splits granite, marble, concrete, and rock by hand—no power tools needed.
HEAT TREATED STEEL TOUGHNESS - Crafted from high hardness steel for unmatched durability and strength under pressure.

The ABuff 10-pack Heavy Duty Wedge and Feather Shims are precision-engineered 5/8 inch metal tools made from heat-treated, high-hardness steel. Designed for manual splitting of stone, granite, marble, and concrete, these lightweight, durable shims feature ergonomic rubber handles for enhanced grip and control. Ideal for professionals demanding reliable, portable, and efficient stone splitting solutions.

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Brand	ABuff
Size	5/8 Inch
Handle Material	Rubber
Blade Edge	Straight
Blade Material	Carbide
Product Dimensions	4"L x 4"W
UPC	663585691485
Manufacturer	abuff
Part Number	ABUS-shimwedge-10pcs-blk-180704
Item Weight	1 pounds
Item model number	ABUS-shimwedge-10pcs-blk-180704
Is Discontinued By Manufacturer	No
Color	Dark Gray
Material	Iron
Item Package Quantity	1
Special Features	Lightweight
Batteries Included?	No
Batteries Required?	No

10 Packs of Heavy Duty Wedge and Feather Shims, Abuff 5/8 Inch Plug Shim and Wedge Concrete Rock Stone Splitter Hand Tools

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