Amazon.com: 6 Pcs Roman Shade Cord Lock Holds up to 3 Cords Austrian Shade Window Blind Lock for Roman and Austrian Shades Home Indoor Use : Home & Kitchen
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Heavy Duty Cord Lock for Roman Shade, 4 divider, 10 cords
Amazon.com: Clear Cord Lock for 1" Horizontal Venetian Mini Blinds : Home & Kitchen
Lowes and Home Depot Cord Lock Mechanism for 1" and 1 1/2" Horizontal – Fix My Blinds
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5 pcs Cord Lock and Tilt Meachanism For 25mm Venetian Blinds, Window Blinds Components - AliExpress