Craftsman 28 Pc. Standard and Metric 6 Pt. Combination Wrench Set Metric Opening Size: 	6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mr SAE Opening Size: 	1/4 in., 5/16 in., 3/8 in., 7/16 in., 1/2 in., 9/16 in Length (in.): 	2(4)|2(4.21)|2(4.87)|5.29)|2(5.85)|2(6.54)|2(7.08)| Material: 	Alloy steel General Warranty: 	Guaranteed forever