A collaboration Design by Jason Brous and Jason Moriel-Riboloff from Tanium Design, The T4 was created to fulfill a multi-use category such as a fighter, every day carry or survival knife. The D2 blade is a multi-purpose hollow ground modified drop point and makes re-sharpening effortless. The T4 utilizes an integrated flipper for quick blade deployment on a ball bearing pivot system as well as an elegant recessed finger groove on each side for easy and comfortable thumb opening. The proprietary designed backspacer is in response to many wanting an open backed flow through folder that is easier to clean while maintaining the strength of a solid backspacer . Brous Blades accomplished this with a larger cutout in the main area while keeping the jimping on the rear for good gripping performance. The titanium liner lock is skeletonized to lighten the knife while adding strength and function. The knife can be deployed either with the flipper or manually with the recessed cut out in the blade. The clip is machined and positioned for right hand tip up carry. Although the blade is quite large, it is very comfortable and the closed length is small compared to similar blades. This knife has been relentlessly tested, beat up, taken apart, opened over 25,000 times and the prototype is still going strong!