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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🎯 Punch Perfect Every Time — The Pro’s Secret Weapon

CUSTOMIZABLE IMPACT - Adjust spring tension for light or heavy marking on wood, metal, or leather.
ONE HANDED POWER PLAY - Automatic spring-loaded mechanism delivers consistent strikes—no hammer needed.
BUILT TO LAST RUST RESISTANT - Solid black oxide finish and alloy steel body for durability in any workspace.
PRECISION PUNCHING ZERO SLIP - Conical hardened steel tip ensures exact hole placement without surface damage.
ERGONOMIC GRIP MAXIMUM CONTROL - Knurled finger grip reduces slippage and enhances handling safety.

The General Tools 78 Heavy Duty Steel Automatic Center Punch is a precision-engineered tool featuring a durable alloy steel body, replaceable hardened steel tip, and adjustable spring tension for versatile, one-handed operation. Designed for professionals and DIYers alike, it delivers consistent, slip-free marking on wood, metal, and leather surfaces with ergonomic handling and rust-resistant finish.

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TrustScore 4.5 | 7,300+ reviews

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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4 days ago

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Material	Alloy Steel
Colour	Solid Black
Brand	General Tools
Item Weight	0.3 Pounds
Hole Count	1
Operation Mode	Automatic
pin hole diameter	0.08 Inches
UPC	038728310668 031113163498 080050277164
Global Trade Identification Number	00038728310668
Manufacturer	General Tools
Item model number	78
Product Dimensions	21.92 x 7.77 x 4.14 cm; 136.08 g
ASIN	B00004T7RF

General Tools 78 Heavy Duty Steel Automatic Center Punch

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