GearWrench 16-Piece Metric 12-Point Flex-Head Combo Ratcheting Wrench Set with FREE 13-Piece SAE Flex-Head Combo Ratcheting Wrench Set Adjustable set screw allows you to set desired head tension Surface drive reduces fastener rounding providing a better hold Flex-Head tilts up to 180 degrees at any interval Serrated beam allows you to feel which way to pull