3 mm Dyneema boom bridle with stainless steel ring, as supplied on all Optimax booms.
The Optimax Optimist deck collar is made of Delrin to create minimal friction between the sleeve and the collar. The oval inner diameter allows the maximum fore/aft and minimum side play and the tapered inner diameter allows the mast to be raked. 4 countersunk mounting holes. Hole size in deck: 57 mm.
A seperate sleeve is available which is fitted around the mast at deck level and protects the mast from wearing.