• fixing angle suspension bracket to upper concrete slab (for screwed-up conceadled grid ceiling and laid-in exposed grid ceiling, suspended from upper concrete slab)
• fixing vertical C Studs to adjacent concrete walls and horizontal U Tracks to concrete slabs (for internal drywall partitions and external walls with steel frame) 
• use plastic wall plugs and suitable screws to fix steel frame to brick walls
  
  

Buggle head, twin threads, needle point (for fixing plasterboards to steel frame up to 0.75mm thickness) or drill point (for fixing plasterboards to steel frame from above 0.75mm to 2.00mm thickness) gypsum screws have the following sizes:

• length = 25mm / 30mm / 40mm / 45mm / 50mm / 60mm
• screw length must be at least 10-12mm more than total thickness of layers of boards fixed to frame
• outer diameter = 3.6mm / 4.2mm
  
  

In addition, there are special screws for fixing steel frame to steel frame with button head, single thread,  needle point (for fixing steel frame up to 0.75mm thickness) or drill point (for fixing steel frame from above 0.75mm to 2.00mm thickness),  length from 10mm to 15mm.