Description Fold-up Metric Hex Key Set - 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, & 6mm - 92.1mm (3 5/8") long over all - Folds up like a knife and snaps into work position for leverage. This item is a suitable alternative for the following: 294-21171, 294-M17, M17