Sealey Grub Screw Assortment 250pc DIN 916 M4 M10 Metric AB045GSAssortment box 250 of Metric grub screws black DIN 916. EASY TO USE Grub Screws serve as a fastener, specifically designed to join or clamp one object or component tightly against another. VERSATILE APPLICATIONS For a wide range of mechanical systems, providing secure fastening without the need for traditional nuts and bolts. MANUFACTURED FROM ROBUST STEEL For durability, designed to withstand rigorous use, with sleek black phosphate finish.