TOOL-FREE BOX MOUNTING - Transition from wall to Rolling Tool Box setup in seconds HEAVY-DUTY ALL-METAL CONNECTION - 70 lb. load capacity STACK PACK COMPATIBLE - For use with a wide range of STACK PACK items ATTACHMENT-READY - Compatible with STACK PACK Rack Rails (FS1604-2) COMPATIBLE WITH SELECT STACK PACK ITEMS - Including the STACK PACK Crate (FS1104), Medium Tool Box (FS1102), Drawers and Cabinet (FS1105, FS1106, FS1107)