Does this clamp work with the kreg r3 jr. pocket hole jig?

No this is not the clamp you want to use. The clamp we have to this style is Irwin 11SP part number 20.

Is this clamp the original Irwin or fake?

From the pictures yes it is original.

How deep can they go into the work? Not how wide do they open. From the overall lenght of 18" including the handle its less that that.

Thank you for choosing Irwin Tools. Our goal is to provide our customers with the highest quality and service. The Throat Depth of the IRWIN VISE-GRIP Original Locking C-Clamp, 18", number 21 is 9-1/2"

So what’s the difference in these now made in China and the harbor freight made in Taiwan clamps

I don't own any Harbor Freight clamps, but I like the Irwin clamps. Truth be known they could have been made in China too.

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Description

🔒 Lock in your project’s success with IRWIN’s unstoppable grip!

COMPACT YET MIGHTY - 6-inch size with 1.5-inch throat depth fits tight spaces without compromise.
LIFETIME CONFIDENCE - Backed by IRWIN VISE-GRIP’s legendary lifetime guarantee—built to last.
ONE HAND LOCKING POWER - Secure your grip instantly with effortless one-hand locking.
PRECISION JAW ADJUSTMENT - Fine-tune clamp opening up to 2 inches for versatile projects.
DURABLE ALLOY STEEL BUILD - Crafted from heat-treated high carbon steel for unmatched toughness.

The IRWIN Tools VISE-GRIP 6-Inch Locking C-Clamp offers a robust 6-inch frame with a 2-inch jaw adjustment and 1.5-inch throat depth. Made from heat-treated high carbon alloy steel, it delivers durable, precise clamping with easy one-hand locking. Perfect for professionals and DIYers alike, it’s backed by a lifetime guarantee ensuring reliability on every job.

Specifications

Material	High Carbon Steel
Brand	IRWIN
Item dimensions L x W x H	9.25 x 3.9 x 0.3 inches
Color	Multi
Style	Regular Tip
Item Weight	0.12 Kilograms
Tensile Strength	1E+3 PSI
UPC	038548000176 038548001715
Global Trade Identification Number	00038548000176
Manufacturer	IRWIN
Part Number	17
Item Weight	4.1 ounces
Product Dimensions	9.25 x 3.9 x 0.3 inches
Item model number	17
Is Discontinued By Manufacturer	No
Size	6"
Finish	Brushed
Pattern	Solid
Shape	Rectangular
Power Source	hand_powered
Item Package Quantity	1
Number Of Pieces	1
Handle Material	Alloy Steel
Measurement System	Metric
Usage	Inside; Amateur
Included Components	CLAMP LOCKING 6R 6"/REG TIP
Batteries Included?	No
Batteries Required?	No
Warranty Description	Manufacturer

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