Master Lock® High-Visibility Aluminum Padlocks Corrosion-resistant, lightweight, strong and secure High-Visibility Aluminum Padlocks feature hardened steel shackles, high security 5-pin Pro Series™ cylinders and dual ball-bearing lock mechanisms. Available in six vibrant colors, the powder-coat paint finish resists scratches and UV deterioration and remains bright, even in corrosive and tough environments. Rekeyable design allows authorized personnel to promptly change key access. Locks measure 1-9/16" wide by 1-31/32" high with 1-1/16" shackle clearance.