Gratnells Callero Tall Maker Adder Storage Unit with 28 Shallow & 7 Deep Royal Blue Trays

The Gratnells Callero Tall Maker Adder Unit is a modular classroom storage solution designed to maximize organization while minimizing floor space. Featuring 28 shallow and 7 deep Royal Blue trays, it provides flexible storage for STEM equipment, classroom supplies, robotics components, and maker materials. Its durable steel frame and student-friendly design make it ideal for busy learning environments.

Why Educators Use It

Schools, makerspaces, libraries, and STEM labs rely on the Callero system to keep learning materials organized, accessible, and ready for instruction. The expandable modular design allows storage systems to grow alongside evolving classroom needs while supporting safe, independent student access.

Key Features

• Includes 28 shallow and 7 deep Royal Blue trays for organized classroom storage
• Tall modular adder unit expands existing Callero Custom storage systems
• Compact footprint provides high-capacity storage without sacrificing classroom space
• Steel frame supports up to 250 kg with 5 kg capacity per tray
• StopSafe runners help prevent trays from being fully removed for added classroom safety
• Smooth, rounded frame design is well suited for student learning environments

Classroom Applications

• Store robotics kits, engineering components, and STEM project materials
• Organize classroom makerspace tools and consumable supplies
• Create accessible resource storage for science and technology labs
• Support collaborative learning with clearly organized student materials