28 piece, (16 long arm & 12 short arm) SAE& METRIC set of CRAFTSMAN TOOLS Allen/Hex key wrenches. CRAFTSMAN hand tools are GUARANTEED FOREVER!! The Long Arm METRIC sizes included are: The Long Arm SAE sizes included are: 1.5mm 7/64″2mm 1/8″2.5mm 9/64″3mm 5/32″4mm 3/16″5mm 7/32″6mm 1/4″7mm 5/16″The Short Arm METRIC sizes included are: The Short Arm SAE sizes included are: 1.5mm 3/64″2mm 1/16″2.5mm 5/64″3mm 3/32″4mm 7/64″4.5mm 9/64″