What sizes does the set start at and go through

The set is measured in 16ths running from 3/8" up to 7/8"

Does anyone know the torque calculation when using it with your torque wrench? Subtraction of the torque reading I'm sure.

In order for Torque to be true to what you have the Torque wrench set at , the Dog Bone, or Crows Foot needs to be at a 90 degree angle to the wrench. If you have it straight out, you have to calculate the extended length from the square drive of the wrench. The formula is M1 = M2 x L1 / L2 M1 is the torque setting of the wrench M2 is the actual torque applied to the nut L1 is the normal length of the wrench measured from the hand held end of the wrench to the square drive center. L2 is the extended length of the wrench measured from the square drive to the new center of the adapter. Keep everything at 90 degrees if you can and you get true torque. This may require removing the dog bone and repositioning without ratcheting until you get the click Hope this helps I believe there is also an APP you can download for calculations

Is there a metric proto set?

There isn't, unfortunately. Napa sells their Carlyle version in metric. Sunex makes a metric set. Also available from Matco, Snap On, Cornwell, and random no-name imports. Looks like Armstrong metric ones are discontinued.

Does anyone know where I can buy just the holder

Go to snapon.com search crowfoot holder. They are like $6 and work great

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Stanley Proto J5100 3/8-Inch Drive Torque Adapter Set, 12 Point, 9-Piece

Product ID: 1911843

Details

Brand
Proto
Finish Type
Brushed
Item Length
7.88 inches
Material
Blend
Number of Pieces
9

📏2-inch adapter measurement for perfect torque calibration

🔥Heat-treated alloy steel for max durability

⚙️12-point fine indexing for precision

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Description

⚙️ Torque Like a Pro, Calibrate with Confidence!

OPTIMIZED ACCESS - Engineered box end wall thickness balances strength with the clearance needed to tackle hard-to-reach fasteners.
MADE IN THE USA QUALITY - Trust in Stanley Proto’s heritage of precision and durability, proudly manufactured stateside for unmatched performance.
VERSATILE COMPATIBILITY - Fits 4, 6, and 12 point fasteners, making it your go-to adapter set for diverse torque calibration tasks.
PRECISION TORQUE MASTERY - 12-point box end design enables fine indexing, speeding up your workflow and reaching tricky fasteners effortlessly.
BUILT TO LAST BUILT FOR PROS - Crafted from heat-treated alloy steel, this set withstands heavy use without compromising strength or reliability.

The Stanley Proto J5100 3/8" Drive SAE Torque Adapter Set is a 9-piece, 12-point socket adapter collection designed for precise torque calibration. Featuring heat-treated alloy steel for enhanced durability and a 2-inch measurement from drive center to adapter opening, it offers fine indexing and optimized access to various fasteners. Made in the USA, this set is engineered for professional-grade strength and versatility.

Specifications

ASIN	B001HWEAAG
Best Sellers Rank	#362,051 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #594 in Torque Wrenches
Bit Compatibilities	1/2, 1/4, 3/8
Brand Name	Proto
Customer Reviews	4.7 4.7 out of 5 stars (299)
Drive Bit Shank Style	Square
Drive System	Square
Finish Types	Brushed
Global Trade Identification Number	00662679230937
Included Components	9 Piece 3/8" Drive Torque Adapter Set - 12 Point
Item Length	7.88 inches
Item Type Name	9 Piece 3/8" Drive Torque Adapter Set - 12 Point
Item Weight	1.3 pounds
Manufacturer	Stanley Proto
Manufacturer Part Number	J5100
Material Type	Blend
Model Number	J5100
Number of Items	1
Number of Pieces	9
UPC	662679230937
Unit Count	1 Count

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AR$650000

Duties & taxes included

In stock

Sold byAmazon ArgentinaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Argentina.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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