We recommend attaching the wall rail to studs with Pan Head screws. Do not attach only to sheetrock/drywall. For additional attachment to sheetrock/drywall, use drywall wall anchors.There is an “A” marked on the rail in intervals of 4” (100 mm) to help locate studs in the wall. Fours “A’s” equal 16” (400 mm) Length 2,463.00 mm Color/finish galvanized/chromatized Hole spacing (inch) 1″ Suitable for Hanging cabinets or closets Installation reference First and last screw holes are 96″ (2438 mm) center to center with 1/2″ (12 mm) of rail on each end Hole spacing 25.00 mm Material Steel