Is there any documentation?

No documentation included. But searching for ULN2003AGP and 28BYJ-48 does provide quite a bit of relevant information.For example: http://www.4tronix.co.uk/arduino/Stepper-Motors.php

What are the shaft dimensions?

5mm diameter, with two flat sides, making the remaining portion in the center 3mm. Profiled portion of the shaft is 6mm long.

Can you control these stepper motors via ESP8266?

I've never used ESP8266. I believe these are the same motors I have, quite easy to use. Google 5V 28BYJ-48 Arduino Instructables, and check out the links.

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5X Geared Stepper Motor 28byj 48 Uln2003 5v Stepper Motor Uln2003 Driver Board with ArduinoIDE (no Wire)

Product ID: 19627803

Details

Brand
Longruner
Compatible Devices
2560 1280 DSP
Finderscope
Focus Type
Manual Focus
Item Weight
10.2 ounces
Manufacturer
Longruner

📏Compact 1.1-inch motor diameter

🔧1/6 reduction gear ratio for torque boost

⚙️5.625° stepping angle precision

Description

⚡ Gear up your innovation with precision and power!

BUILT TO LAST - Robust design with LED status indicators and reliable driver boards backed by a 1-year warranty.
ALL IN ONE KIT - Includes 5 stepper motors plus driver boards, perfectly packaged for organized, ready-to-go setups.
PRECISION IN EVERY STEP - Ultra-fine 5.625° stepping angle ensures smooth, accurate motion for your projects.
TORQUE MEETS EFFICIENCY - 1/6 gear reduction ratio delivers enhanced torque without sacrificing speed.
PLUG PLAY COMPATIBILITY - Seamlessly integrates with Arduino, Raspberry Pi, and multiple microcontrollers for rapid prototyping.

The Longruner 5X Geared Stepper Motor kit features five compact 28BYJ-48 stepper motors with 5.625° stepping angle and 1/6 reduction gear ratio, paired with ULN2003 driver boards. Compatible with ArduinoIDE and popular microcontrollers like Raspberry Pi, this kit offers precise, reliable motion control in a neatly packaged set, ideal for prototyping and small automation projects.

Specifications

ASIN	B015RQ97W8
Additional Features	Built-in Driver Board and Arduino Compatibility
Best Sellers Rank	#389,863 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #4,870 in Single Board Computers (Computers & Accessories) #7,926 in 3D Printer Parts & Accessories
Brand	Longruner
Built-In Media	5 PCS Stepper Motors
Compatible Devices	2560, 1280 DSP, ARM, PIC, AVR, STM32, Raspberry Pi
Customer Reviews	4.6 4.6 out of 5 stars (194)
Finderscope	Straight-Through
Focus Type	Manual Focus
Item Weight	10.2 ounces
Manufacturer	Longruner
Manufacturer Part Number	LK67
Model Name	stepper motor controller
Model Number	LK67
Mount	Altazimuth Mount
Number of Items	5
Number of Packs	1
Power Source	Battery Powered
UPC	825349132508 702647176741
Warranty Description	1 year warranty
Zoom Ratio	5.625x

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