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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ABuff 10 Packs 5/8 Inch Heavy Duty Wedge and Feather Shims

ABuff 10 Packs 5/8 Inch Heavy Duty Wedge and Feather Shims

Product ID: 81913401

Details

Blade Edge
Straight
Blade Material
Carbide
Brand
ABuff
Handle Material
Rubber
Size
5/8 inch 10pcs

⚡Heat-treated toughness

🔩Precision 5/8 inch size

🛠️High hardness steel

¥12384

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Split with power, precision, and confidence every time!

COMPLETE 10 PACK SET - Always have the right tool on hand—never miss a beat on your project timeline.
COMPACT 5 8 INCH DESIGN - Optimized size for maximum leverage and accuracy in every wedge and shim.
PREMIUM HEAT TREATED STEEL - Durability and toughness that withstands the toughest jobs without fail.
TRUSTED BY PROS LOVED BY DI YERS - Join thousands of satisfied users who rely on ABuff for flawless results.
ENGINEERED FOR PRECISION SPLITTING - Effortlessly split stone, granite, marble, and concrete with expert control.

The ABuff 10-Pack Heavy Duty Wedge and Feather Shims are precision-engineered hand tools crafted from heat-treated high hardness steel. Designed for splitting stone, granite, marble, and concrete, each 5/8 inch shim and wedge delivers reliable toughness and control. This professional-grade 10-pack ensures you’re always equipped for efficient, clean splits, making it a must-have for masons and serious DIYers alike.

Specifications

ASIN	B07F7Y1T5X
Best Sellers Rank	#36,013 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #21 in Shim Stock
Blade Edge	Straight
Blade Material	Carbide
Brand Name	ABuff
Customer Reviews	4.5 4.5 out of 5 stars (602)
Handle Material	Rubber
Item Dimensions L x W	4"L x 4"W
Item Highlight	Plug Shim and Wedge Concrete Rock Stone Splitter Hand Tools
Item Weight	16 ounces
Manufacturer	ABuff
Manufacturer Part Number	ABUS-shimwedge-10pcs-blk-180704
Model Number	ABUS-shimwedge-10pcs-blk-180704
Number of Items	10
Number of Packs	10
Set Name	10 Pack Wedge and Feather Shims
Size	5/8 inch, 10pcs
UPC	663585691485
Unit Count	10 Count

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