All of TR's pillars come as standard with undercut or non standard without undercut. The advantages of undercut are that there is no need for washers in assembly and they offer a flush fit. This data sheet details the range of materials and sizes the spacers and pillars are available in.
‘Archaic rules’ torn up to green light new nuclear
Lack of data about windpower being cheaper than nuclear was, I felt, the question that you replied to. and as the context is energy security it would...