Crewsaver Sport 50N Buoyancy Aid Color:Red providing a secure fit with

providing a secure fit with standard 8mm pintles

Fixing Hole Centers 38 mm Height  58 mm Inside Width  32 mm Rod Size  6 mm Thread Length  25 mm Weight  54 g

The 40 mm fiddle is an excellent choice for 3:1 and 4:1 tackles on dinghy vangs and mainsheets

it's worth checking the rules directly

Crewsaver Sport 50N Buoyancy Aid Color:Red providing a secure fit withAdjustable shoulder and dual waist straps combined with a unique arrangement of lightweight and soft foam provides a bespoke and comfortable fit. This centre zip buoyancy aid features reflective piping and an easily accessible expanding storage pocket with attachment point. The Sport 50N provides the perfect option for those who seek a high quality product at a highly competitive price point. KEY FEATURES Lightweight supersoft foam construction