The Buck Knives 590 Paradigm Folding Knife was developed as an innovation, clip carry knife boasting high-end materials and features to enhance functionality. The 590 utilizes a blade flipper for quick and easy one-hand deployment with the ASAP assisted opening technology. Busk’s Shift Mechanism rotating bolster lock provides a robust locking mechanism and prevents accidental deployment. To open, glide the bolster up and activate the flipper with a flick of your finger. To close, slide the bolster up, close the blade and then slide the bolster back in place.