WHLLING GJ12 Automatic Center Punch 6 Inch
- Material Type: Stainless Steel
- Sheet Count: 2
- Number Of Items: 2
- Number Of Packs: 2
Last refreshed Jun 25, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A hardened steel punch pair with a named tip alloy, priced and sized for both bench work and a glove box emergency tool.
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ASIN: B0B8HCRM4YModel: GJ12Category: Center Punches
Overview
A 6 inch hardened steel automatic center punch pair aimed at machinists and carpenters, with a knurled adjustable cap for setting spring tension without a hammer.
Whlling builds this punch from hardened steel with a 6150 chrome vanadium tip that has gone through heat treatment, which is a step up in stated material spec from many budget punches in this category. The knurled body is meant to keep grip steady while you dial in tension for anything from a light scribe to a full punch mark.
- 6 inch hardened steel body
- 2 pack set
- Knurled adjustable tension cap
- 6150cr-v heat treated tip
Who it's for
Shop users and carpenters who want a punch built from a named hardened steel spec rather than an unspecified generic steel, for marking, starting holes or breaking a window in an emergency.
Pros and cons
- 6150 chrome vanadium tip after heat treatment
- Adjustable tension from light to heavy marks
- Works on wood, steel, glass and plastic
- Doubles as an emergency window breaking tool
- 6 inch length is on the longer side for tight spaces
Performance notes
Downward pressure compresses the internal spring until it trips, driving the tip into the work without a hammer swing, and the adjustable knurled cap sets how much force that trip delivers. The 6150 chrome vanadium tip and heat treatment are meant to keep that tip from dulling or deforming as fast as a plain steel point would.
Specifications
| Brand | Whlling |
|---|---|
| Model | GJ12 |
| Dimensions & fit | |
| Item Weight | 0.44 pounds |
| Pin Hole Diameter | 0.5 inches |
| Construction & materials | |
| Material Type | Stainless Steel |
| Color | Black |
| Included components | |
| Number Of Packs | 2 |
| Other details | |
| Sheet Count | 2 |
| Number Of Items | 2 |
| Part Number | GJ12 |
| Operation Mode | Automatic |
| Item Highlight | Spring Loaded Center Hole Punch With Adjustable Knurled Cap For Machinists And Carpenters |
Frequently asked questions
What tip material does the Whlling punch use?
A 6150 chrome vanadium steel tip that has gone through heat treatment, mounted in a hardened steel body.
How many punches come in the pack?
Two, sized at 6 inches with a half inch diameter shank.
Can it start a drill hole?
Yes, the listing describes it as usable to punch, mark, scribe and start drill, nail or screw holes.