do these attach to the wall with brackets?

No, you twist one end, then pull it out (or push it in) to the desired length, then twist it back to lock in place.

i understand 11/13 mm in diameter, but is that 1 inch? i dont understand

the inner rod is 11mm which is .4 inches and the out side road is 13mm which is .5inches. if you look at the image you can see that one side is slimmer then the other thats what they mean by diameter

How long are these on the smallest setting? There are 3 different sizes mentioned for this product and my window is small.

Hi, I looked up the Aizesi rods and they were listed at: Black, size 16 - 28 inches and 28 - 48 inches. They also have the Hotop rods , which I purchased, for 11.81 - 20 inches and 15.7 - 27.6 inches. If your window is around 12 inches wide, I would suggest going with the Hotop small, 11.81 - 20 inches. Hope this helped. K

Color	white
Manufacturer	QINGYUN
Material	Metal rod with plastic ends
Item Weight	0.35 Pounds
Maximum Weight Recommendation	6.6 Pounds
Product Dimensions	2.03 x 2.03 x 70.1 cm; 158.76 g
Package Weight	0.27 Kilograms
Batteries Required	No
Batteries Included	No

AIZESI 2本 スプリング式 カーテンロッド 28-48インチ 28"-48" ホワイト

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AIZESI 2本スプリング式カーテンロッド 28-48インチ 28"-48" ホワイト