8 pcs. SAE Combination set includes - 5/16 inch, 3/8 inch, 7/16 inch, 1/2 inch, 9/16 inch, 5/8 inch, 11/16 inch and 3/4 inch. Surface Drive provides a stronger grip on fasteners, reducing fastener rounding. Sleek head design enables access to tight spots where a ratchet will not fit. Ratcheting box-end needs as little as 5 degrees to move fastener VS 30 degrees for standard box end wrenches. KDT9308 Features: -8 Piece SAE Combination Gear Wrench Set. Includes heavy duty plastic storage tray for tool chest storage.