Molded using durable Copolymer plastic. BACK tabs can hook on louvered panels. Specially molded top edges allow stacking on any smooth surface. Angled front edge makes it easy to see contents and to pick parts. Slots in front hold identification tags, cards or labels. Molded finger grips make handling easy and comfortable. Accommodate slot for 1 divider. Fit neatly on other cabinet and shelving brands. Measures 4 inch width by 3 inch height by 7 inch depth.