MESA Self-drilling Countersunk Black 4.2 x 20 mm screws - 100

These countersunk Tek screws have been perfectly designed to work with Hyperion Decking 3mm fasteners, starter fasteners and Hyperion Cladding Sentinel fasteners, when installing on MESA Support aluminium bearers.

• Countersunk black screws - Box of 100
• To be used for aluminium bearers
• 6mm head, 4mm thread, 20mm length
• 20mm screws do not work with Hyperion Decking 6mm fasteners