DURABLE ALUMINUM: 'PPE Required Beyond This Point' signs are made from heavy-duty 40 mil thick aluminum. Unlike steel signs, our aluminum signs do not rust. Signs easily last up to 7 years outside. EASY INSTALLATION: Signs have four 3/16 inch corner holes. Mount with screws, nails, tie-wraps or wires. Signs can also be attached with foam or double-sided velcro tape. Sign attachment accessories are not included. LAMINATED PROTECTION: With lamination, graphics are protected from weather and abuse to preserve a fresh look. Graffiti can be cleaned off too. Clear UV laminate resists chemicals, UV rays, water, and abrasion. ANSI COMPLIANCE: Safeguard your workplace from accidents and liabilities by placing our high-quality signs that follow ANSI guidelines. These are universally recognizable and encourage safe work practices. PACK CONTENTS: One 14 x 10 inch yellow, black and white aluminum sign.