Sewing machine thumb screws with slot :   10 pcs per pack  (made in Taiwan)

Diameter : 9/64" (3.57mm) thread diameter,  40 threads per inch,  Tap #503

Overall length : 12.2 mm,  Thread length : 9.5 mm

Description : 1.  Fits virtually many home and industrial sewing machines

                      2.  Attaches presser foot to foot bar.

                      3.  Attaches folders, binders etc. to base (bed) 

                          of sewing machines.