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: 276786593

Details

Brand
General Tools
Colour
Black
Item weight
0.3 Pounds
Material
Heavy Duty
Product dimensions
19L x 44W x

🔩0.08 in precise pin hole diameter

⚙️Adjustable spring tension for custom strikes

🛠️Replaceable hardened steel tip for durability

₨16409

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Description

⚡ Punch Perfect Marks Like a Pro—No Hammer Required!

ERGONOMIC KNURLED GRIP - Secure, slip-resistant handling reduces fatigue and boosts control during long projects.
BUILT TO LAST IMPRESS - Heavy-duty steel body with rust-resistant black oxide finish—your reliable partner in every workshop.
CUSTOMIZABLE IMPACT FORCE - Adjust spring tension to tailor light or heavy strikes for wood, metal, or leather surfaces.
PINPOINT PRECISION EVERY TIME - Achieve flawless marks with a 0.08-inch hardened steel tip that never slips.
EFFORTLESS ONE HANDED OPERATION - Automatic spring-loaded punch mechanism means no hammer needed—work smarter, not harder.

The General Tools Heavy-Duty Automatic Center Punch #78 is a precision-engineered marking tool featuring a replaceable hardened steel tip with 0.08-inch diameter for exact hole placement. Its adjustable spring tension allows for customizable impact force, enabling one-handed operation without a hammer. Designed with a knurled grip and rust-resistant steel body, it’s built for durability and comfort, making it ideal for machinists, metalworkers, and DIY professionals seeking reliable, efficient marking on wood, metal, and leather.

Specifications

ASIN	B00004T7RF
ASIN	B00004T7RF
Best Sellers Rank	#107,169 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #26 in Center Hand Punches
Brand Name	General Tools
Color	Black
Country Of Origin	China
Country of origin	China
Customer Reviews	4.3 4.3 out of 5 stars (557)
Customer reviews	4.3 4.3 out of 5 stars (557)
Date First Available	1 January 2024
Global Trade Identification Number	00038728310668
Included Components	Unit^Instruction Guide
Is Discontinued By Manufacturer	No
Item Dimensions L x W x H	19L x 44W x 244H millimeters
Item Type Name	Digital Sliding T-Bevel
Item Weight	136 g
Item model number	78
Manufacturer	GE Lighting
Manufacturer	GE Lighting
Material Type	Heavy Duty Steel
Model	78
Number of Items	1
Number of Packs	1
Operation Mode	Manual
Part Number	78
Pin Hole Diameter	0.08 Inches
Product Dimensions	21.92 x 7.77 x 4.14 cm; 136.08 g
Sheet Count	1
UPC	038728310668 031113163498 080050277164
Unit Count	1 Count

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₨16409

Duties & taxes included

In stock

Sold byAmazon Sri LankaDelivered 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 Sri Lanka.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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