Vintage "Mac" 1/2" drive, metric impact socket set of 13. 10mm to 19mm, 21, 22 and 24 mm. The knurling on them, (see pic), tells me that they are vintage but I haven't beeen able to figure out when they're from yet. Any help in that would be appreciated. Being made by Mac I expect these to be as good as the day they left the factory. Being vintage Mac even more so.