DURABLE MATERIAL: Heavy-duty plastic provide large load bearing up to 100lbs, it measure 13''(L) x 7.1''(W) 6.5''in depth, durable and medium size perfect for storage. COMPATIBLE: 2 metal spring hook for each box included, suit for 7 slots horizontal E-track rails, vertical or single E-track slot which straight distance need keep 8-1/8" apart. MOVE YOUR TOOLS AROUND AS NEED: Spring fitting hook attached to E-track rails, and you can transfer the storage box for different usage purpose. Each storage bin only weigh 2.7lb, lightweight and portable. KEEP YOUR TRAILER ORGANIZED: This E-track storage bin for easy reach and keep trailer floor tidy, perfect for trailers, warehouse, trucks, distribution centers, vans. PACKAGE CONTENT: 2-pack E-track storage bin included. Package include: 2pcs x storage bin