How do you drive these? What kind of adapter, socket or tool fits their square ends?

You could use 12-pt. sockets to turn them with (1/4"-drive or 3/8"-drive, depending on size). These extractors are imported (Taiwan), so you would need metric sockets to do that. Use a hammer to set them in the fastener first. Other possibilities are to use a tap handle from a tap-and-die set, or a small T-handle, if you have the room to turn them.

Could i get 1/4 grease fitting out?

Yes, I used it to get a 1/4" NPT out.

Can it remove the threaded part of a broken spark plug stuck inside the engine?

Yes you can, I did. I’m gonna write a review on these next week with pics. My plugs used a 5/8 socket to remove them. One broke, I used the 2nd to biggest extractor to get the threaded portion of the spark plug out, these square work better than the spiral.

What is the cause of breaking a car spark plug? Why does oil leak after the spark plug is opened?

Plugs break if you overtighten them or allow the socket to float By opened I'm assuming that you mean when it's removed, your valve guides are toast and are probably missing the seals and your rings are probably severely worn

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CTA Tools 9030 Fluted Screw Extractor Set, 5-Piece Hand Tool Kit for Broken Studs, Set Screws, Pipes and Fittings

Product ID: 19337604

Details

Brand
CTA Tools
Color
Multi
Item dimensions L x W x H
7.1 x 4.75 x
Material
Metal
Size
1/8" 3/16"

📏Fits fasteners 1/4" to 5/8"

🔧5 precision extractor sizes

⚙️4-point tapered fluted design

€ 38.32

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Description

🔩 Break free from broken fasteners—extract like a pro!

COMPACT READY - Compact 7.1 x 4.75 inch kit fits easily in your toolbox for on-demand fixes.
PRO LEVEL CONTROL - Hand-powered for steady, precise extraction—no power tools needed, perfect for delicate jobs.
4 POINT FLUTED GRIP - Special tapered design bites firmly into damaged screws for reliable extraction every time.
PRECISION 5 PIECE SET - Covers common broken fastener sizes from 1/4" to 5/8" for versatile repair needs.
HARDENED METAL DURABILITY - Crafted from hardened metal to withstand tough removal jobs without wear.

The CTA Tools 9030 Fluted Screw Extractor Set is a 5-piece hardened metal kit designed to remove broken studs, screws, and fittings sized 1/4" to 5/8". Featuring a unique 4-point tapered fluted design, it ensures a secure grip on damaged fasteners after drilling the correct pilot hole. Compact and hand-powered, this set is essential for professionals and DIYers tackling stubborn hardware failures.

Specifications

ASIN	B00IYTFSM4
Best Sellers Rank	#112,140 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #128 in Tap Extractors
Brand	CTA Tools
Color	Multi
Customer Reviews	4.3 4.3 out of 5 stars (1,390)
Fastener Type	Bolt, Stud, Screw
Finish Types	Unfinished
Global Trade Identification Number	00053001090303
Included Components	Fluted Screw Extractor Set, 5-Piece
Item Dimensions	7.1 x 4.75 x 0.38 inches
Item Type Name	Fluted Screw Extractor Set, 5-Piece
Manufacturer	CTA Tools
Material Type	Metal
Model	9030
Number Of Items	1
Number of Pieces	1
Part Number	9030
Set Name	5-Piece Fluted Screw Extractor Set
Size Name	1/8", 3/16", 15/64", 5/16", 3/8"
UPC	053001090303
Unit Count	1 Count

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€ 38.32

Duties & taxes included

In stock

Sold byAmazon GERMANYDelivered 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 GERMANY.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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