hey, this looks cool...Wait, imperial spanner sizes? WTF is this, the 1950s??
or 2013 in the US!
going by the Kickstarter prices, $43 for the smallest PB-5, $64 for the medium PB-7 (the first with a pulley, I wonder if it has any bearings), $125 for the large PB-9. The PB-9 is made from 3/8ths plate, that's thick! By my rough measurements I think it will be about 12cm long.