Is this for two? or just one?

There are 2 of them: One for the front and the other for the rear derailleur. They work great. You also could skip them and use a long cable.

Are these concave or flat? And does it actually have one barrel adjuster and one wing adjuster? Photo shows two barrels.

Concave with a square socket that fits over a square brazeone mount. Right and left stops both with gray plastic barrel adjusters.

Does this come with all the hardware you need? i.e. the screws to install on a bike?

It came with hardware, but I did not use it. I installed the cable stoops on the existing shift lever studs. I used a locknut instead of the original nuts because I would not need to adjust the like shifter levers do.

can this one patch the hole of my downtube from where the original shifter come from?

There should be a brazed-on post that the old shifter was attached to. It is a square piece with a threaded hole. This will fit over it allowing you to run the cable from your brake lever/shifters through this housing, and then to the derailleurs. You will need cable housing from the shifters to this device. This works perfectly for upgrading from downtube mounted shifters to handlebar mounted shifters.

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Shimano Housing Stop for 1-1/8" Down Tube

Product ID: 10669738

Details

Brand
SHIMANO
Item Diameter
28.58
Material
Plastic
Valve Type
Schrader
Wheel Size
26 Inches

💪Durable plastic construction

⚙️Precision fit for 1-1/8" down tube

🚴‍♂️Optimized for road bike performance

S$35

Duties & taxes included

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Description

⚡ Upgrade your ride with Shimano’s precision housing stop – because every detail counts!

VALUE THAT LASTS - Affordable replacement that keeps your shifting smooth and your bike performing at its peak.
ROAD READY DURABILITY - Crafted from high-quality plastic to withstand daily cycling demands without fail.
SEAMLESS COMPATIBILITY - Engineered specifically for 1-1/8" down tubes ensuring a perfect fit every ride.
EFFORTLESS INSTALLATION - Designed for quick and easy setup, so you spend more time riding and less time wrenching.
TRUSTED SHIMANO QUALITY - Genuine Shimano part backed by a limited warranty and a 4.8-star rating from 700+ riders.

The Shimano Housing Stop for 1-1/8" down tube is a genuine, durable plastic replacement part designed for road bikes with 28mm tire width. Lightweight at just 18g, it ensures precise cable housing fitment, enhancing shifting performance. Highly rated by over 700 cyclists, this Shimano component offers reliable quality and easy installation backed by a limited warranty.

Specifications

ASIN	B001JH9KUY
Best Sellers Rank	#92,651 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #20 in Bike Shift Cables & Housing
Bike Type	Road Bike
Brand	SHIMANO
Brand Name	SHIMANO
Compatible Tire Width Maximum	28 millimeters
Compatible Tire Width Minimum	28 millimeters
Customer Reviews	4.8 out of 5 stars 715 Reviews
Global Trade Identification Number	00689228127333, 04524667127338
Included Components	Spares & Brake & Shift Levers
Item Diameter	28.58 millimeters
Item Highlight	CS50 Housing Stops for Steel & Titanium Down Tubes
Item Type Name	Parts
Item Weight	18.14 g
Item Width	5.5 inches
Manufacturer	Shimano Spares
Manufacturer Part Number	FBA_Z67B91000
Material	Plastic
Material Type	Plastic
Model Number	Y67B91000
Number of Items	1
Size	1.1" x 1.1"-1.1"
UPC	689228127333
Unit Count	1 Count
Valve Length	2.17 inches
Valve Type	Schrader
Warranty Description	Limited Warranty
Wheel Size	26 inches

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