For attaching friction stays with countersunk holes to PVCu frames. Thread Dia. mm: 4.3 Length mm: 16 Head Type: Shallow Pan Countersunk Recess Type: Phillips Thread Type: Single Point Type: Gimlet Finish: Zinc Material: Carbon SteelSize 4.3 x 16 - 1000Pcs Timco Window Screws - Friction Stay - Shallow Pan Countersunk - PH in Silver