Can you use these more than once?

Yes, I have used them at least 30-40 times.

do you think i could split oak logs 2 foot dia with these?

No these are for splitting rocks not wood. They would just sink in and not do anything. You need to either get a splitting wedge for wood or a splitting maul. Something like this: https://www.amazon.com/Manual-Log-Splitter-Wedge-Diamond/dp/B01N3SXC9W/ref=sr_1_5?crid=1QZ1KADKO3GEU&keywords=wood+splitting+wedges&qid=1650974922&sprefix=wood+splitting+%2Caps%2C270&sr=8-5 Or this which I have and works awesome: https://www.amazon.com/Fiskars-Core-Maul-Inch-751110-1003/dp/B014M9LQGG/ref=sr_1_5?crid=127EHA9K6FCXK&keywords=splitting+maul&qid=1650974975&sprefix=splitting+maul%2Caps%2C183&sr=8-5

Has anyone tried these on thicker concrete? I have a piece 3ft x 3ft x 12" thick that I'm hoping to split into smaller sections.

I have not split concrete, but I have easily split granite thicker than 12". Watch examples on youtube.

Should I use 5/8 in or 3/4 in carbide drill bits?

Use the drill bit size of the shims (feathers). 5/8 drill bit for 5/8 shims. You can always enlarge the hole if necessary. Important - do NOT drill deeper than the length of the shim.

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Wedge and Feather Shims Concrete Marble Granite Rock Stone Splitting Hand Tools (5/8", 10Pcs)

Wedge and Feather Shims Concrete Marble Granite Rock Stone Splitting Hand Tools (5/8", 10Pcs)

Product ID: 72696783

Details

Brand
Ymkf Sqqr
Color
10pcs
Handle Material
Metal
Head Material
Alloy Steel
Item Weight
1.48 kg

🔩3-Wedge System - Efficient Stone Splitting

🪨Splits Concrete, Marble, Granite Effortlessly

⚙️Alloy Steel Head - Durable Precision

Description

🛠️ Split Stones Like a Pro — Don’t Get Left Behind!

SLEEK PROFESSIONAL - Finished in classic black for a clean, modern look that fits seamlessly in any professional toolkit.
EFFORTLESS EFFICIENCY - Innovative 3-wedge composition ensures smooth, controlled splitting with minimal effort.
ENGINEERED FOR ENDURANCE - Crafted with premium alloy steel and metal handles to withstand the toughest stone splitting jobs.
PROFESSIONAL GERMAN DESIGN - Experience superior control and accuracy inspired by expert German engineering standards.
VERSATILITY MEETS PRECISION - Perfectly designed for concrete, marble, granite, and rock, making it your go-to tool for diverse projects.

The Wedge and Feather Shims set features 10 durable pieces crafted from alloy steel and metal handles, designed for professional-grade splitting of concrete, marble, granite, and rock. Its efficient 3-wedge system and German-style precision make stone splitting faster and more controlled, while the sleek black finish adds a professional edge to your toolkit.

Specifications

ASIN	B0732V3KXS
Best Sellers Rank	#668,064 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #207 in Masonry Chisels
Brand	Ymkf Sqqr
Brand Name	Ymkf Sqqr
Color	10pcs
Customer Reviews	4.5 out of 5 stars 224 Reviews
Grip Type	Standard
Handle Material	Metal
Head Material	Alloy Steel
Head Style	Flat
Item Weight	1.48 kg
Manufacturer	Ymkf Sqqr
Manufacturer Part Number	GP-106
Model Number	GP-106
Number of Items	10
Style Name	German
Unit Count	10 Count

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