It is in the build quality and the matching between the parts. Yost is a good brand with different levels of quality that is reflected in the price.
The high end (red color) is forged from ductile iron (130,000 PSI strength) and not from cast iron. It is stronger and less prone to cracks. There are adjustment screws to control the level of "play" and the lead screw/nut seems to be better. They also have special jaws to hold pipes and the jaws are replaceable.
I have the following 3 metal working vises from Yost and they are really good and a great value in my experience/opinion:
6" Heavy-Duty Forged Steel Bench Vise
https://www.amazon.com/dp/B00DMDO9AE/?tag=atomicindus08-20
(the price is further down today to $153.90!!!)
4" Heavy-Duty Forged Steel Bench Vise
https://www.amazon.com/dp/B00E8IWTHC/?tag=atomicindus08-20
(almost the same price as the 6" today, buy the 6"!)
5" Heavy-Duty Multi-Jaw Rotating Combination Pipe and Bench Vise
https://www.amazon.com/dp/B00CBL62HQ/?tag=atomicindus08-20
(very good for pipe work and other large items)
I hope this helps.
Ariel
Why is everyone constantly posting TOOLS in the NON TOOL thread?
They really should be combined
Or segmented by year like a few other threads:
Amazon Deals 2018
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Does anyone know why this vise is listed as adi-6 but the description lists the fsv-6 ? Which vise is the one on sale?Yost Vises ADI-6 6" Heavy-Duty 130,000 PSI Austempered Ductile Iron Bench Vise with 360-Degree Swivel Base
These are exceptional quality vises, I have the 4" and 6" versions.
Regular Price: $290-
Today's Price: $158.99
https://www.amazon.com/dp/B00DMDO9AE/?tag=atomicindus08-20
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Ariel
Does anyone know why this vise is listed as adi-6 but the description lists the fsv-6 ? Which vise is the one on sale?
Sent from my G8141 using The Garage Journal mobile app
This is not what the yost site says."ADI" is the material Yost uses, the actual vice on sale is model #FSV-6. I have this vice and it is very nice. Well worth the sale price.

KNIPEX Tools 00 20 06 US2, Pliers Wrench 3-Piece Set - $126 (regular amazon)
https://www.amazon.com/dp/B005EXNT2Y/?tag=atomicindus08-20
They did a price adjustment for me.I know I posted this just yesterday, but it dropped another $10, even further into 'best price' territory, so I'm considering it a deal again.
I'm contemplating buying another set. I don't need another set.
Current price at time of posting is just under $117.
I know I posted this just yesterday, but it dropped another $10, even further into 'best price' territory, so I'm considering it a deal again.
I'm contemplating buying another set. I don't need another set.
Current price at time of posting is just under $117.
I know I posted this just yesterday, but it dropped another $10, even further into 'best price' territory, so I'm considering it a deal again.
I'm contemplating buying another set. I don't need another set.
Current price at time of posting is just under $117.
Very well be because Knipex released new versions of some of the Plier Wrenches.