Craftsman 4-PC. SAE Inch Open End Ratcheting Wrench Set # 21936 Craftsman 4-pc inch open-end ratcheting wrench set features a patented, open-ended, ratcheting tooth design Each wrench is double ended and consists of two sizes as follows: 5/16 x 3/8 inch, 7/16 x 1/2 inch, 9/16 x 5/8 inch and 11/16 x 3/4 inch Combines the speed of a ratchet with the access of an open-end wrench Made of alloy steel, so it will last and last Craftsman Forever Guarantee