Premium Material: Roll pins are made of 45# carbon steel material, durable and strong, with good fastenning effect Its surface is finished with a black oxide process to prevent rust and corrosion | Product Feature: These hollow fasteners expand with force and have chamfers on both ends to install flush with the holes, preventing any accidental damage and used for positioning, connecting and fixing between parts | Exquisite Storage Box: Metric roll pin assortment set are packed in a durable and sturdy Box to efficiently bear the weight of the whole package. The box is clearly labelled so that you can quickly identify the size you need by the label | Wide Applications: Whether for commercial use or home improvement, these split pins are a vital part of building and maintaining fixtures and appliances and repairing, cars, or trucks as well as industrial uses | 430 Pcs Roll Pin Set: This tool set includes 430 slotted spring pins in the most commonly needed metric sizes—M1.5 M2 M2.5 M3 M4 M5 M6 Spring Dowel, to help you deal with a wide range of fastening work