Laser Replica 15:1 Boom Vang Assembly The Barton boom vang assembly gives all the advantages of systems costing twice the price. 15:1 purchase is achieved through clever design of the base plate, fitted with the unique Barton swivelling triple cam block. It is simple to fit and easy to use.Compatible With:Laser class sailboats In the Box: Barton base plate - Spectro anodised aluminium with three fixing bolts 00 931 Series 0 triple swivel cam block (attached to base plate by shackle) 00 110 Series 0 single fixed eye block (attached to base plate by shackle) 00 211 Series 0 double block with becket 01 091 Series 1 single tang block with becket and curved kicker key for boom 3&'; 11" (1.2 M) of 5/32" (4 mm) - dyneema line for primary Red control line 9&'; 11"(3 M) of 5/32" (4 mm) line for secondary Red control line *Sold as and Individual