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 containsmany 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. This set contains inserts in many different sizes that you can use as needed.There are total 70 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(inner diameter*outer diameter) & Quantity: M2*4 10pcs M2.5*5 10pcs M3*6 10pcs M4*8 10pcs M5*8 10pcs M6*10 10pcs M8*12 5pcs M10*12 5pcs Weight: 104g / 3.7oz (approx.) Package list:1 box* Inserts