2 Racing deckcollars: Both have an oval and tapered inner diameter.
The oval inner diameter allows the maximum fore/aft play and minimum side play.
The tapered inner diameter allows the mast to be raked.
4 Countersunk mounting holes. Hole size in deck : Ø 57 mm
EX1210 has a sperate sleeve which is fitted around the mast at deck level and protects the mast from wearing.