Does this socket fit a 1-1/8 size rail? Is the rail opening 5/16" or 3/8" by 1-1/8"?

This socket fits a 7/8 inch rail The 7/8 inch rail fits the the inside socket

What do I order for a 1-1/4" slide opening rear mount bracket 2-5/8" long?

These brackets that I ordered were replacements for brackets that were broken. I used the existing drawer rails. hope this helped.

Do they make these out of metal? The plastic is always breaking.

There are metal brackets available. I did find some when I was doing my research..however, I went with these and they are stronger than the brackets that came with my 2011 Thor...it's been more than a year of pretty much full time use and I haven't had any issues..

Will this bracket fit 7211 drawer slides

Yes they can as well as item # R 7240.

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🔧 Upgrade your drawer game with precision and power!

DURABLE BUILD - Thick, resilient white plastic designed to withstand daily wear and tear.
OPTIMIZED SUPPORT - Engineered specifically for side-mounted drawer glides to maintain perfect alignment.
HEAVY DUTY CAPACITY - Handles up to 75 lbs per pair—built for your most demanding storage needs.
EFFORTLESS INSTALLATION - Quick setup with included fasteners—no extra trips to the hardware store.
PRECISION FIT ADJUSTMENT - 2-7/8 inch socket depth allows seamless front-to-back drawer slide tuning.

Prime-Line R 7227 Drawer Track Back Plates are durable, white plastic brackets designed to support side-mounted drawer glides. Measuring 5/16" x 7/8" with a 2-7/8" adjustable socket depth, they ensure precise alignment and easy installation with included fasteners. Rated to support up to 75 lbs per pair, these back plates combine strength and convenience for professional-grade drawer performance.

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AR$44833

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TrustScore 4.5 | 7,300+ reviews

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Excellent communication throughout the order process. Product is perfect.

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Mounting type	Side Mount
Weight limit	75 Pounds
Manufacturer	Prime-Line Products
UPC	049793072276
Global Trade Identification Number	00049793072276
Number of items	1
Part Number	R 7227
Product Dimensions	7.62 x 3.33 x 5.23 cm; 45.36 g
Item model number	R 7227
Size	5/16 in. x 7/16 in.
Style	Drawer Slide
Finish	White
Item Package Quantity	1
Maximum weight capacity	75 Pounds
Included Components	Drawer back plates
Batteries included?	No
Batteries Required?	No
Item Weight	45.4 g

Prime-Line Products R 7227 Drawer Track Back Plate, 5/16 in. x 7/8 in., Plastic, White, 1 Pair (1 LH, 1 RH)

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