Stainless steel collar, supplied with a 16mm Harken block for attaching the clew to the boom of your LASER. - - Stainless steel collar, supplied with a 16mm Harken pulley for attaching the clew to the boom of your LASER.this collar must not be dismantled.a practical and safe system at the same time.not LASER approved. Clew sleeve with 16mm Harken airblock for Laser®/ILCA®. DESCRIPTION Windesign Sailing clew sleeve for Laser. The stainless steel sleeve will be fixed to the Laser boom and does not have to be detached after sailing. The quickest system for fixing the clew. Despite the clew strap and hook above the Windesign clew sleeve is not allowed for racing. Laser® is a registered trademark of Velum Limited an Performance Sailcraft Australia Ltd. This product is compatible with Laser® but is not an original Laser® product.