Material: aluminum, solid plastic, bakelite. Please understand before purchasing: Determine the size you need. 1. Is it the standard corrugated box in the picture; 2. Determine the length*width*height of the corrugated box after folding. Suppose you have two types of airplane boxes: 32*23*8mm and 43*15*4mm. The maximum length is 43mm and the maximum width is 23mm. Please choose a clamp specification with a length of ≤45mm and a width of ≤25mm, and all will be compatible. This versatile clamp is designed for securely holding various items, including corrugated boxes and small packages. Its durable construction ensures long-lasting use in shipping, storage, and organization tasks. Ideal for warehouse, office, and home applications, this clamp provides a reliable grip without damaging surfaces. Lightweight and easy to handle, it simplifies your packing and sorting processes. Perfect for both professional and personal use, this clamp is a must-have tool for efficient workspace management. Ensure compatibility by measuring your items before purchase.