Select Options Metric Sae - Heat Treated - Drop Forged - Choice of Sae Metric Sizes: - Sae Sizes: 3/8 x 13/32, 7/8 x 1/2, 9/16 x 19/32, 5/8 x 11/16 & 11/16 x 3/4 Inch - Metric Sizes: 10 x 11, 12 x 13, 14 x 15, 16 x 17 & 18 x 19 mm Weight: 2.25 Lbs