Evot Diecast Models Brass Metal Replacement Pulley set. (Set of 50), 17mm. Made In America.Evot Diecast Models is proud to announce "Made In America" Brass Metal Replacement Pulleys for Conrad, NZG, WSI and all other mobile and crawler cranesin 1:50th, 1:48th and 1:87th scales that are factory made with plastic pulleys. To find what mm sizes are neededyou will need to measure the diameter of the of the plastic pulley for comparison into Brass. We have these exclusively manufactured for us in the USA.