Boxed Cross Countersunk Screw Assortment. Standard mixed kits are in ready stock for fast delivery, and we offer Custom Boxed Fasteners with personalized specifications, thread lengths and packaging configurations. Made of high-quality carbon steel and stainless steel, these screws feature neat sharp threads and firm locking performance with flat countersunk mounting surface. Classified boxed packaging ensures easy sorting, access and inventory management. As versatile Boxed Fasteners, they are widely used in furniture assembly, home appliance installation and daily hardware maintenance.