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" Drive SAE Torque Adapter Set, 12 Point, 9PC

Stanley Proto J5100 3/8" Drive SAE Torque Adapter Set, 12 Point, 9PC

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 exact torque

⚙️12-point fine indexing for precision

🛠️Heat-treated alloy steel for durability

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¥50193

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Details

Brand
Proto
Finish Type
Brushed
Item Length
7.88 Inches

Description

🛠️ Elevate your toolkit with American-made precision and power!

COMPLETE SIZE RANGE - 9-piece set covers 3/8" to 7/8" with no skipped sizes—never compromise
UNMATCHED DURABILITY - Heat-treated alloy steel built to last through heavy use
OPTIMIZED ACCESS SPEED - 12-point box end design enables quick, fine indexing in tight spaces
PRECISION TORQUE CALIBRATION - Engineered for flawless torque accuracy every time
VERSATILE FASTENER COMPATIBILITY - Fits 4, 6, and 12 point fasteners seamlessly

The Stanley Proto J5100 3/8" Drive SAE Torque Adapter Set is a 9-piece, 12-point socket set crafted from heat-treated alloy steel for superior strength and durability. Designed for precise torque calibration, it features a 2-inch adapter measurement and a specially engineered box end for enhanced access to difficult fasteners. Made in the USA, this set fits 4, 6, and 12 point fasteners and offers a complete size range from 3/8" to 7/8" without skipping sizes, ensuring professional-grade performance and reliability.

Specifications

ASIN	B001HWEAAG
Best Sellers Rank	#308,104 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #512 in Torque Wrenches
Bit Compatibilities	1/2, 1/4, 3/8
Brand	Proto
Brand Name	Proto
Customer Reviews	4.7 out of 5 stars 299 Reviews
Drive Bit Shank Style	Square
Drive System	Square
Finish Type	Brushed
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	1.29 Pounds
Manufacturer	Stanley Proto
Manufacturer Part Number	J5100
Material	Blend
Material Type	Blend
Model Number	J5100
Number of Pieces	9
UPC	662679230937
Unit Count	1.0 Count

Reviews

J**T

21.04.2015

R**K

8.09.2020

I**O

2.10.2025

K**N

1.09.2025

S**O

3.09.2025

T**.

6.09.2020

S**D

3.12.2022

P**O

24.07.2019

F**E

14.02.2019

A**R

16.11.2018

S**N

15.10.2019

H**.

24.08.2023

F**T

18.10.2018

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