Bellingham round bottom round top balusters have a 1-11/16" dia base and a 1-3/8" pin top dia. 32" Balusters are used on knee wall (or closed stringer) applications. > 35" & 39" Balusters are used on open stringer applications. Turning profiles follow the railing (rake rail alignment). 42" Balusters are used for volutes and turnouts. Balusters are sold unfinished and manufactured by Kinzel Wood Products. Proudly Made in USA. Please contact us about custom sizes 1-866-683-2025.