15mm 18mm Square Groove S/S Friction Stay Left and Right Limit
https://www.allyhardware.com/products/15mm-18mm-square-groove-s-s-friction-stay-left-and-right-limit/

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15mm 18mm Square Groove S/S Friction Stay Left and Right Limit
Our ALLY HARDWARE friction stays are perfect for 4 bar hinge windows, offering smooth operation and secure hold. Choose from sets of left and right, 201/304 stainless steel, bottom groove sizes of 15mm/18mm square, and sizes ranging from 8-24 inches.

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