Has anyone tried breaking a 1/4" glass plate with this? Did it work?

If you wish to break plate use a hammer, this will work on tempered glass if any thickness

Anyone use one of these to extract broken bolts? Is it strong enough to get a punch for a bit? Looking to remove a bolt inside my engine block.

I dont think john p actually ever tried this. Dont know about the cheaper utility version but the big #78 which Ive had for 15 years will put a divot in anything short of a broken drill bit. Ive removed broken taps with it a few times by softening the metal around the tap then repeatedly punching the tap in reverse. This tool has amazing power. That said, mine misfires about every half dozen clicks but doesnt bother me considering how well it works.

Do i need any machine to use this or take off the bike bolts

I dont understand the question,this is a center punch,not a take off tool.I used mine once,and the tip broke off.It was a piece of junk,so I don't know.If the bike bolts are rusted,or welded,on it seems like to me you are going to have to cut em off.

Would this work well to get a starter dimple for unibit/step bit when going thru metal studs or panel boxes?

It might. It works better if you drill a starter hole with a twist drill first. Usually the step-bit and unibit drills don't have enough of a point to start in the dimple that the center punch makes.

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General Tools Heavy-Duty Automatic Center Punch #78 - Nail Punch Tool to Mark and Scribe - Machinist Tools

Product ID: 1865119

Details

Brand
General Tools
Color
Solid Black
Item Weight
4.8 ounces
Material
Alloy Steel
Product Dimensions
0.75"L x x

🎯Replaceable hardened steel tip for precision

🔧Adjustable spring tension for versatile use

⚙️Steel body for durability

199.34 DT

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Description

🎯 Mark it right, every time – the pro’s secret weapon!

SECURE GRIP SAFER HANDLING - Knurled finger grip reduces slippage and enhances control.
TRUSTED BY PROS FOR DECADES - General Tools’ legacy of innovation trusted by craftsmen and DIYers alike.
PRECISION AT YOUR FINGERTIPS - Replaceable hardened steel point ensures exact marking without slips.
EFFORTLESS ONE HANDED OPERATION - Automatic spring-loaded mechanism eliminates the need for a hammer.
BUILT TO LAST DESIGNED TO PERFORM - Robust steel body with rust-resistant black oxide finish for longevity.

The General Tools Heavy-Duty Automatic Center Punch #78 is a precision machinist tool featuring a durable steel body, replaceable hardened steel tip, and adjustable spring tension for effortless one-handed marking on wood and metal. Its knurled grip ensures secure handling, making it a trusted choice for professionals and DIY enthusiasts seeking accuracy and reliability.

Specifications

ASIN	B00004T7RF
Best Sellers Rank	#55,325 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #22 in Center Punches
Brand Name	General Tools
Color	Solid Black
Customer Reviews	4.3 4.3 out of 5 stars (581)
Global Trade Identification Number	00038728310668
Included Components	Unit^Instruction Guide
Item Dimensions L x W x H	0.75"L x 1.75"W x 9.63"H
Item Type Name	Digital Sliding T-Bevel
Item Weight	4.8 ounces
Manufacturer	GE Lighting
Material Type	Alloy Steel
Model	78
Number of Items	1
Operation Mode	operation
Part Number	78
Pin Hole Diameter	0.08 inches
Sheet Count	1
UPC	038728310668 031113163498 080050277164
Unit Count	1 Count

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TrustScore 4.5 | 7,300+ reviews

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199.34 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Tunisia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

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Customer service was outstanding when I had questions about the product.

2 days ago

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