3/8" cable locks fall into the category of cafe or walk-off locks. They are designed to discourage opportunists and joy riders when a bike will be left for a short period of time in a relatively low risk area. I have just a standard 6' cable with a loop at each end (Brinks brand) and a small keyed Masterlock. I have no delusions about this stopping a serious bike thief, but it's enough to stop some lazy loser from taking a free ride to the local pawn shop.