Product details:

Flex head tilts up to 180 degrees at any interval and features off-corner loading for a better grip and reduces fastener rounding. Adjustable set screw allows you to set desired head tension with spring washer design providing continuous head tension. Ratcheting box-end needs as little as 5 degrees to move fastener VS. 30 degrees for standard box end wrenches. Serrated wrench beam allows you to feel which way to pull.