The product is a box of A2 stainless steel hex half lock nuts in various sizes ranging from M2.5 to M30. The nuts are designed with an external hex drive style and are made from high-quality stainless steel. The pack sizes available are 10, 25, 50, 100, 200, 500, and 1000 nuts, making it convenient for various projects requiring different quantities. This product is ideal for business, office, and industrial applications where durable and reliable fastenings are needed.