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
136 g
Material
Heavy Duty
Product dimensions
19L x 44W x

🎯Replaceable hardened steel tip for precision

🔩Steel body for durability

⚙️Adjustable spring tension for custom force

฿5800

Duties & taxes included

In stock

Sold byAmazon ThailandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎯 Mark your mark with precision and power — don’t get left behind!

BUILT TO LAST - Robust steel body with rust-resistant black oxide finish stands up to heavy-duty use.
SECURE GRIP SAFER WORK - Knurled finger grip minimizes slippage and enhances control during intricate tasks.
VERSATILE FOR PROS DI YERS - Perfect for metalworkers, machinists, automotive pros, and creative DIY projects alike.
PRECISION AT YOUR FINGERTIPS - Replaceable hardened steel point ensures exact, slip-free marking every time.
EFFORTLESS ONE HANDED OPERATION - Automatic spring-loaded mechanism eliminates the need for a hammer, boosting efficiency.

The General Tools Heavy-Duty Automatic Center Punch #78 is a precision marking tool featuring a durable steel body, replaceable hardened steel tip, and adjustable spring tension for customizable force. Designed for professionals and DIY enthusiasts, it offers one-handed operation with a knurled grip for safety and control, making it ideal for metal, wood, and automotive applications.

Specifications

Asin	B00004T7RF
Best Sellers Rank	#24 in Center Hand Punches
Date First Available	1 January 2024
Is Discontinued By Manufacturer	No
Item Model Number	78
Manufacturer	GE Lighting
Product Dimensions	21.92 x 7.77 x 4.14 cm; 136.08 g

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