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This 25 piece ball hex key set includes both common MM sizes as well as SAE sizes. Each hex key has a ball head design on the opposite end allowing for hard to reach angles up to 30 degrees. They’re also all labeled by size on a plastic organizer clip. Hex Keys are Made of Drop Forged, Heat Treated Steel Construction Metric Sizes Include: 1.3mm, 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 7mm, 8mm, and 10mm SAE Sizes Include: 1/20”, 1/16”, 5/64”, 3/32”, 7/64”, 1/8”, 9/64”, 5/32”, 3/16”, 7/32”, 1/4" and 3/8”