4 x T8 pan head, silver, 9.8mm self-tapping screws for the PowerBook 500 series and PowerBook Duo range. On the 50 series, they are used to secure the display bezel (4), the clutches (2 each) and LCD panel (4) to the lid panel.
On the Duo they are used to secure the trackball assembly (2), the hard drive (3) and the rear of the chassis (2).