The Walder boom brake is an essential safety device that ensures the indispensable protection of your crew and equipment. Jibing remains a delicate and dangerous maneuver for even the most experienced sailor. To eliminate the dangers inherent when jibing, the Walder boom brake controls the horizontal and vertical movement of your boom – allowing it to sweep gunwale to gunwale with complete safety. Aluminium Arm-guides. For boat lenght 6 to 9 m. For main sail less than 18 m².