Flexcut Tri Jack Pro Carving Knife. The Tri-Jack Pro is the newest multi-tool in Flexcut’s Carvin’ Jack series. The Tri-Jack has three blades that lock in place- a roughing knife, a detail knife, and a mini-cutting knife. The roughing knife is great for modeling surfaces and creating texture, while the detail and cutting knives let you easily make the finest cuts. The Pristol Grip design minimizes hand fatigue and is made of aerospace-grade aluminum with a quarter-cut cherry inlay.