Self Drill Heavy Wood Fix 5.5X85mm (20)

Timber to Steel. 

• Used for joining Timber to steel frame buildings.
• No.5 drill tip for self-drilling heavy gauge steel up to 12.5mm.
• Screw fitted with breakaway wings that create a clearance hole to protect thread from engaging timber when drilling through.
• Breakaway wings will ream a hole then break-off when they contact the metal surface to be drilled.  Thread will then engage with metal.
• PH2 insert..