SmartLock system features a tight, audible click closure that helps ensure maximum food freshness. Wide temperature resilience range (20F to 180F) enables placement in freezers and heated display cases. Smooth front panel makes sticker-labeling easy. Strong, rib-reinforced sides and back accommodate heavy items and provide enhanced crush resistance. Break-resistant hinge is flexible enough for easy closure and reliable enough for repeated openings and closings. - SmartLock closure. - Wide temperature resilience range: 20F to 180F. - Smooth front panel. - Strong, rib-reinforced sides and back.