If any extractor is difficult to get a bite on a rounded out socket will a little hammering on the extractor damage it?

A few taps to "set" the extractor are fine. As you'll note, these are wedge-shaped (tapered) to jam the extractor into the bolt to grip it. Work slowly; i.e., start with a socket or regular wrench to grip and turn the extractor counter-clockwise after it's seated to remove the bolt. DON'T use a cordless drill to speed up the process; it will likely chew things up, making it worse (this is true with any extractor). These are also referred to as "easy-outs"; if used properly, they can save the day. These DO NOT work well with plastic pipe fittings, as they tend to expand the threads of the fitting, jamming it in even tighter. As Robert George mentions, don't drill the hole bigger than one-half (1/2) the diameter of the bolt you're trying to remove, as that will expand the metal threads to jam it in even tighter. On the smaller ones, you may need a sliding T-handle wrench (not included with this set) to grip the extractor to turn it. You can buy those separately (0-1/4" opening and 1/4"-1/2" opening), or you may already have them if you own a tap and die (thread-cutting) set.

Does it include a 25/32

Yes it does. It has all sizes from 1/8" through 7/8" in 1/32" increments.

Is that 3/8" drive on the back of these?

These extractors do not have a 3/8" drive in the back of them. Instead, they have a Hew-head and are designed to be used with either a 1/2," 5/8", 3/4", 7/8" or 1" socket or spanner (depending on screw size being extracted) to drive them.

I have a 5 mil recessed hex bolt in a brake caliper that is stripped out. Can I use this to get the bolt out ?

Recommended tool to use would be a EX-2 Spiral Screw Extractor Part number 53402.

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IRWIN Screw Extractor Set, Hex Head, Multi-Spline, 25-Piece (53227)

Product ID: 1905831

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Details

Brand
IRWIN
Item Length
9 Inches
Material
Blend
Finish Type
Brushed
Number of Pieces
1

🌀Aggressive left-hand spiral grip

📏Etched sizes for precision

🔩25-piece multi-spline set

Description

🔧 Break free from broken fasteners with IRWIN’s unstoppable grip!

ORGANIZED PORTABLE - Comes in a rugged carrying case that keeps all 25 pieces neatly arranged and ready to go—never lose a tool again.
AGGRESSIVE SPIRAL DESIGN - Left-hand spiral flutes dig deeper as resistance increases, delivering unmatched gripping power when you need it most.
PRECISION ENGRAVED SIZES - Each extractor is laser-etched with its size and recommended drill bit, eliminating guesswork and speeding up your workflow.
DURABLE HIGH CARBON STEEL - Built tough to withstand heavy-duty use, ensuring longevity and reliability on every job site or DIY project.
VERSATILE EXTRACTION POWER - Effortlessly removes broken studs, bolts, and socket screws across a wide size range (1/8"-7/8") for all your high-torque challenges.

The IRWIN Screw Extractor Set (53227) is a professional-grade, 25-piece multi-spline hex head tool kit designed to remove broken bolts, studs, and socket screws. Featuring an aggressive left-hand spiral design for superior grip, precision-etched sizes for quick identification, and durable high-carbon steel construction, this set is housed in a heavy-duty carrying case for ultimate portability and organization. Perfect for high-torque applications, it’s a must-have for any serious toolkit.

Specifications

Brand	IRWIN
Item Length	9 Inches
Material	Blend
Finish Type	Brushed
Number of Pieces	1
Drive System	Hex, Spline
Drive Bit Shank Style	Hex
UPC	100069446563 753956451081 247215322750 024721532275 971473131976 031113161920 031112511139 765245631401 088021739512 787721825029 782386197115 784497166332
Global Trade Identification Number	00024721532275
Bit Compatibilities	Bolts, Socket Screws, Studs (various sizes)
Manufacturer	IRWIN
Part Number	53227
Item Weight	1 pounds
Item model number	53227
Is Discontinued By Manufacturer	No
Size	One Size
Color	Multi
Style	25-pc multi-spline extractor set
Finish	Brushed
Pattern	Solid
Shape	Rectangular
Power Source	hand_powered
Item Package Quantity	1
Compatible Fastener Range	Bolts, Socket Screws, Studs (various sizes)
Included Components	Unit^Instruction Guide
Batteries Included?	No
Batteries Required?	No
Warranty Description	Limited lifetime
National Stock Number	5120-01-368-3966

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