SINGER Overlocker Hex Head Screw - Holds upper blade/knife in place
Genuine Part Number 0544407000
14U MODELS 544, 554, 555, 557
14SH MODELS SH644, SH654 ,SH754, 14CG754
14HD854
14U MODELS - 34A, 44, 46, 64A, 65, 85, 132, 134, 234, 244, 285, 286, 344, 354, 444, 454, Pro4D