The latest in the Cardsharp series of knives by Ian Sinclair is the Cardsharp 4 ($90), a lightweight, CNC machined aluminum pocket knife with a credit card design for ease of carry. The latest design features a new two-stage Zytel safety lock, an improved riveted construction for increased durability, and a blade sharp enough to cut through a seat belt or just about anything else in no time at all, should the need ever arise.
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