This thing works fine for 14/18mm sized pipes. Good solid glass that extends from 3" size to 6". The very end of the tube has a perc ball head. Cool GRAV logo on the side and the heatshrink that holds it all together also has the GRAV logo and some strange symbols. My only complaints are 1) I wish the half inch extension on the outside wasn't there and was flush instead.
2) 14mm female joint needs to have the glass frosted not crystal/smooth. So they frosted the 18mm male joint but left the 14mm female joint clear so now my ash catcher spins very easily instead of keeping tight.
3) the inside adjustable glass tube & perc head are almost too small and makes pulling drags off the bong harder.