ART BIN-Super Satchel Box with 2 Removable Thread Trays securely holds thread spools regardless of how the closed box is stored. Spool trays offer the capacity to hold (224) 20mm spools; (108) 32mm spools; or (30) 45mm spools. Designed to easily stack and work together. Molded in translucent Acid Free polypropylene. Measures: 3.5Hx14Wx15D. (accessories not included).