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hello, i will be very thankful to you, if somebody will can help me know which screw is and how i can open it? i tired Roberton, quadrex, phllips - but i can't open it. maybe its quadrex #4, but i don't found that its exists. maybe someboby here can help? many thanks in advance.

hello everyone. i have a chair with this screw. i want t open it, buy don't know what is the type of this screw. i added here the picture. can, somebody, kindly let me know what is the type of this screw? many thanks in advance.