Symmetrical thread for bone screwsRange: HC2.9, HC3.5, HC3.9, HC 4.2
Asymmetrical thread for bone screwsRange: HD4.0, HD4.5
0.075 - 3.0 mm (508 -8 TPI)
0.5 - 3.0 mm (46 -8 TPI)
0.25 - 1.5 mm
80 - 16 TPI