can the rails be put end to end for twice the length if you don't mind a little bump will roller go from one rail to the next at all if lined up good.

If you don't mind a bump they can be aligned as you suggest. But for CNC use this bump can be enough to throw off the linear measurement. I think you can disconnect the round runner from the rail and stagger the joint so they will act like one long rail however there will still be a bump.

What part can I use to stop the blocks from sliding off the end of the rail?

I went to my local hardware store and bought stops. Some are in two halves others are made to slip over the bar and tighten. They come in various sizes. Look in the specialty nuts, bolts, and fasteners section.

Where can I order the carriage blocks? My order had missing blocks and I need to order.

I had the same issue. The packaging of the rails was surly inadaquate to were the block just fell out of the packaging. It happened twice since I returned the originally ordered rail system along with the second set where the blocks were missing. Finally, I ordered the rails and blocks separately. For the blocks, I ordered "4pcs SBR20UU Aluminum Block 20mm Linear Motion Ball Bearing Slide Block Match for SBR20 20mm Linear Guide Rail" from amazon here.

I need longer then 2200mm. Are there extensions available? Or are there two pieces that can be connected together available?

Hi buyer， Thank you for your time to the mail. I'm very sorry. There's no longer one than 2200mm. Hope this helps. Best wishes, Jennifer Customer Support

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⚙️ Elevate Your Automation Game with Precision & Durability!

EFFORTLESS INSTALLATION - Pre-drilled aluminum alloy rails make setup a breeze—get your CNC or automation project running faster.
BUILT TO LAST BUILT TO PERFORM - Crafted from carbon steel and bearing steel with chrome plating for unbeatable durability and rust resistance.
PRECISION LINEAR MOTION MASTERY - Experience ultra-smooth, high-accuracy sliding with industrial-grade SBR20 rails and bearing blocks.
VERSATILE AUTOMATION POWERHOUSE - Ideal for DIY CNC routers, lathes, laser welders, and industrial robots—engineer your future with confidence.
ENGINEERED FOR HIGH LOAD RIGIDITY - Optimized structure supports heavy-duty applications without compromising smooth linear motion.

The VEVOR OrangeA Linear Rail Kit features two 1500mm SBR20 carbon steel rails and four SBR20UU bearing blocks with aluminum alloy housing. Chrome plating ensures corrosion resistance and high hardness, delivering smooth, precise linear motion ideal for CNC machines, automation equipment, and industrial robotics. Easy to install and engineered for heavy loads, this kit is a must-have for professionals demanding reliability and performance.

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Manufacturer	OrangeA
Part number	Linear Rail
Item Weight	11.2 Kilograms
Product Dimensions	152.4 x 5.08 x 5.08 cm; 11.16 kg
Item model number	20-1500mm Linear Rail
Size	SBR20-1500mm
Material	Aluminum
Item thickness	20 Millimeters
Item Package Quantity	1
Batteries Included?	No
Batteries Required?	No

VEVOR OrangeA Linear Rail 2PCS SBR20-1500mm Linear Slide Rail 4PCS SBR20UU Bearing Block CNC Kit Linear Rails and Bearings Kit CNC Rails Linear Rail Set forAutomated Machines and Equipments

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