1100% brand new and high quality. 2Made of brass material, these inserts are durable and heat-resistant. 3These are several inserts set in different lengths that you can choose as needed. 4Each set contains total 20 pieces of inserts that you may use for many projects. 5Small size and light weight, these inserts are convenient to use. Features: 100% brand new and high quality. Made of brass material, these inserts are durable and heat-resistant. These are several inserts set in different lengths that you can choose as needed. Each set contains total 20 pieces of inserts that you may use for many projects. Small size and light weight, these inserts are convenient to use. Specification: Material: Brass Size(D*L*d):(Optional) M5*5*6.3 M5*6*6.3 M5*8*6.3 M5*10*6.3 M5*12*6.3 Weight: 11g~24g / 0.4oz~0.8oz (approx.) Package list: 20 * Inserts