The Master Lock No. 4689T TSA-Accepted luggage locks feature a 1 in wide metal body for durability. The shrouded design minimizes shackle exposure and protects against bolt cutter attacks. The 1/8 in Dia shackle is 9/16 in long and made of steel, offering resistance to cutting and sawing. Transportation Security Administration (TSA) screeners can open, inspect and relock bags locked with a TSA-Accepted lock. Lock your checked baggage with the lock TSA screeners won't cut. The limited lifetime warranty provides peace of mind from a brand you can trust.