KLOUD City&reg; 2pcs Black 335 TSA accepted luggage dial travel lock Travel Sentry Certified lock which is accepted and recognized by the TSA Allows you to secure your checked baggage with this special lock Airport security inspects your luggage quickly and sends them on their way Instruction manual for resetting password included in packages. Set your own combination convenience Dimensions (L*W*H): 2.5"x1.3"x0.5". The instruction is showed in the description