what diameter of the shaft ?

20mm - after I received it, I figured out that the last number in the model # is the diameter.

What is the difference between the SBR12, SBR16 and SBR20 models?

I believe the difference is the diameter of the rails in millimeters.

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VEVOR Linear Rail Slide SBR12-1000mm 2 PCS and 4 PCS SBR12UU Slide Blocks Linear Guide Rail and Bearings Kit for Automated Machines DIY Project CNC Router Machines

Product ID: 490192068

Details

Bearing Type
Linear Bearing
Brand
VEVOR
Item Weight
3.9 Kilograms
Item dimensions L x W x H
31.5 x 3.15 x
Material
Alloy Steel

📏1000mm precision rail length

⚙️4 high-precision SBR12UU bearing blocks

🛡️Durable chrome-plated carbon steel

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Description

⚙️ Glide into precision — where engineering meets effortless motion!

BUILT TO LAST - Crafted from chrome-plated carbon steel and bearing steel with aluminum alloy housing for superior rust resistance and durability.
SMOOTH PRECISION GLIDE - Experience ultra-smooth linear motion with industrial-grade SBR12UU bearing blocks for flawless CNC and automation projects.
PLUG PLAY INSTALLATION - Effortless setup with a no-maintenance design—just align, slide, and secure your rails in minutes.
VERSATILE AUTOMATION POWERHOUSE - Perfect for DIY CNC routers, laser machines, industrial robots, and large-scale transmission equipment.
ENGINEERED FOR MILLENNIAL MAKERS - Join the cutting-edge community of creators who demand precision, reliability, and sleek engineering in their projects.

The VEVOR Linear Rail Slide SBR12-1000mm kit includes two 1000mm chrome-plated carbon steel rails and four high-precision SBR12UU bearing blocks with aluminum alloy housing. Designed for smooth, durable, and maintenance-free linear motion, it’s ideal for CNC routers, automated machinery, and industrial applications requiring reliable, precise guidance.

Specifications

ASIN	B0BLSC6936
Best Sellers Rank	#19,995 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #10 in Linear Motion Guides
Date First Available	November 8, 2022
Item Weight	7.48 pounds
Item model number	SBR12-C 1000L
Manufacturer	VEVOR
Product Dimensions	39.37 x 2.56 x 3.94 inches

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