有呀，类似下面这种。现在城市中还很流行。用Metal post更加稳固持久：

https://www.homedepot.com/p/HOFT-End-Post-Kit-44-in-x-3-in-x-3-in-Black-Aluminum-Railing-End-Post-and-Hardware-Kit-A4-USKEP4401/320033763?source=shoppingads&locale=en-US&pla&mtc=SHOPPING-BF-CDP-GGL-D21-021_008_FENCING-NA-NA-NA-SMART-NA-NA-NA-NA-NBR-NA-NA-NEW-PMAX&cm_mmc=SHOPPING-BF-CDP-GGL-D21-021_008_FENCING-NA-NA-NA-SMART-NA-NA-NA-NA-NBR-NA-NA-NEW-PMAX-71700000099380193--&gclid=CjwKCAiA2fmdBhBpEiwA4CcHzYF2gPpnITaNsGZfgt7YNgOy_Vn3s4f0S8cTm2_EgHVhhgQ8TbKY-hoCxC0QAvD_BwE&gclsrc=aw.ds