Kershaw Injection 3.0 Liner Lock Knife (3" Bead Blast) 3820

MSRP: $54.95
Our Sale Price: $9.99!
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Item #BHQ-14796


  • Overall Length:7.00"
  • Blade Length:3.00"
  • Blade Thickness:0.11"
  • Blade Material:8Cr13MoV
  • Blade Style:Drop Point
  • Blade Grind:Flat
  • Finish:Bead Blast
  • Edge Type:Plain
  • Handle Length:4.00"
  • Handle Thickness:0.51"
  • Handle Material:G-10
  • Color:Black
  • Frame/Liner:Stainless Steel
  • Weight:3.30 oz.
  • User:Right Hand, Left Hand
  • Pocket Clip:Tip-Up
  • Knife Type:Manual
  • Opener:Thumb Stud
  • Lock Type:Liner Lock
  • Brand:Kershaw
  • Model:Injection
  • Model Number:3820
  • Designer:Todd Rexford
  • Country of Origin:China
  • Best Use:Everyday Carry
  • Product Type:Knife


The Injection 3.0 folder is a Todd Rexford design with milled G-10 scales and a stout liner lock frame. It features custom details that include a decorative pivot, machined countersunk thumb stud and a chamfered backspacer too. The flat ground drop point blade has a bead blast finish and plain cutting edge. The Injection is loaded with all the things you'd want in an everyday carry knife, including a reversible tip-up carry pocket clip.

The Injection 3.0 is the smaller version of the Injection model, and has the same custom features as the larger version, the Injection 3.5 knife.


Customer Reviews

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I call it my light saber
James K.
I call it my light saber because it opens fast and its so sharp it cuts through everything I throw at it. There are a few problems with it one is the thumb stud is kind of a pain to open, the pocket clip is extremely hard to attach to your pocket and there is no jimping at the spine .
Good Value
Gerald D.
Came good and sharp from the factory and the lock functions smoothly. The only downside so far is the clip is really tight and takes some force to slide slide over the side of my pocket. Still, for $10, I wish I had gotten a second one.
Great Little EDC
Michael J.
1) Outstanding functional value for the price!
2) Rock solid comfortable handle, no flex whatsoever with the G-10
3) Not a deep-carry pocket clip, but rides acceptably low where Kershaw has positioned it
4) My first experience with 8Cr13MoV steel, edge came “so-so” out of the box. Was super easy with only few swipes on sharpener for scary sharp edge
5)Great blade tip for precision work

1) No jimping on rear blade spine for thumb traction, can be slick with wet hands
2) Thumb studs not the most comfortable.

Quick Thoughts:
25 days since purchase. I picked up both the 3.0” and 3.5” versions. Honestly you can’t beat the Injection models, they give you a lot of usable knife for such little investment.

My only comment to those considering a purchase, is the thumb studs. They are 100% fine for normal use. However, if you want a knife you can open/close 500 times while watching a movie, you’ll get one heck of a sore thumb. The studs have traction grooves milled into them which can become painful.
Amazing value
Christian M.
As a knife collector this knife has completely amazed me. It is a great size for carrying, has a good clip, and fits well in pockets. The blade is sharp and great for slicing, the handle is compact yet big enough to be comfortable for my big hands. Both drawing and folding the knife are super smooth and easy with the well placed thumb studs. Locking is consistently solid. This knife is as good or better than almost all my other knives including much more expensive knives.

The only flaws I can find are the clip comes down on rough G10 which can be abrasive and the holes in the G10 don't all go all the way through so they can accumulate pocket lint and be hard to clean.
Kershaw Injection 3.0
Bryan T.
This is one of my favorite knifes to hold. I hold it in my hand and it feels as good and as nice as a $200 knife. Build quality is unreal for 30 bucks. Blade is ultra sharp and its finish looks great. The only short coming if you can call it that is my blade does not glide open with slightest flick. Put thumb on stud and requires you to rotate open. Blade is so sharp and I risk my thumb's skin flicking open. I've tried to loosen pivot a smidge but think it jeopardizes blade play.