Features Made of durable flexible nitrile rubber, offering high temperature resistance. Includes multiple sizes: 3/8 inch (5 pcs), 5/16 inch (5 pcs), 1/4 inch (10 pcs), 7/32 inch (20 pcs), 5/32 inch (20 pcs), 3/16 inch (20 pcs). Provides a tight fit to help prevent vacuum leaks. Suitable for use with manifolds, capping lines, and hoses during testing of emission control systems, vacuum lines, and diaphragms. Complete set of 6 sizes, 80 pieces total, organized in a clear plastic case for easy storage and quick access. Specification Dimensions: 20 x 11 x 3 cm - 5 pcs: 3/8 inch vacuum hose insert - 5 pcs: 5/16 inch vacuum hose insert - 10 pcs: 1/4 inch vacuum hose insert - 20 pcs: 7/32 inch vacuum hose insert - 20 pcs: 5/32 inch vacuum hose insert - 20 pcs: 3/16 inch vacuum hose insert Product Includes 1 x Storage box with 80 pcs vacuum hose inserts