ALECO Heavy-Duty Strip Doors in Custom Cut Sizes offer 2-way visibility for safety, substantially reduce the loss of heated and cooled air, and prevent the flow of dust and contaminants from parking or loading areas. Clean-up and maintenance costs are reduced, and sound transmission is effectively lowered to help you meet OSHA requirements. Doors are made of fire-resistant, self-extinguishing PVC. Clear-Flex II® rounded edges won’t cut, non-stick additive prevents clinging. Choose either economical smooth vinyl strips for excellent visibility or Scratch-Guard® strips that have bumpers to resist scratches and abrasions—stay clearer longer. Units are shipped knocked-down with installation instructions. Punched 3/8" dia. holes on 2" centers/3" centers on 4"W strips.Made in USA.NOTE: ALECO Heavy-Duty Strip Doors in Custom Cut Sizes are not available online. Call a Certified Product Specialist to order. Custom-Cut strips are not returnable.