Ok, I’ve understood.
INTEGRATED WASHERA2 stainless steel washer with integrated A2/EPDM washer for sheet-metal fastening.
TORX BITConvex head with torx slot for secure fastening of sheet metal on wood.
SHEET METALIdeal for fastening gutters to wood, corrugated sheet metal and general sheet-metal works.
STAINLESS STEELAvailable in stainless steel A2 and copper-plated stainless steel A2 (CU). Available in painted stainless steel on request (RAL8017, 9002, 3009).