Internal & External Use Can Be Screwed, Nailed or Bolted Application: Heavy Duty angle brackets for connecting timber to timber, timber to concrete or timber to steel. Different sizes of openings increase their versatility and enable fixing on different types of pivot connectors. Material: DX51D + Z275 Thickness: 2.5mm Fixing: Carpentry nails ANCHOR ø4; screws for timber ø6, ø10; bolts M10, M12; concrete anchors M6, M12.