Features 1、100% brand new and high quality. 2、Made of brass material, these inserts are durable and heat-resistant. 3、These are several inserts set in different lengths that you can choose as needed. 4、Each set containsmany inserts that you may use for many projects. 5、Small size and light weight, these inserts are convenient to use. Specification 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 many 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) & Quantity:(Optional) M4*4*6.3; 30pcs M4*5*6.3; 30pcs M4*6*6.3; 30pcs M4*7*6.3; 20pcs M4*8*6.3; 20pcs M4*10*6.3; 20pcs M4*12*6.3; 20pcs Weight: 20g~38g / 0.7oz~1.3oz (approx.) Package list: 1 set * Inserts Package List