Standard height mainsheet jammer with two arms. Available with or without 60mm Pro-Ratchet Block. The arms can be set to rotate in 180, 220 or 360 degrees by adjusting the stopper pins on the underside of the main arm. The arm swivel features two rows of ball bearings to ensure a super smooth rotation of the jammer arm. Includes A..76-496 aluminium cam cleat with mega pro-lead on the main arm and A..77-497 aluminium cam cleat with mega pro-lead on the lower arm. The lower arm also features two sheaves to help run rope from the middle of the base into the lower cleat. Ideal for boats which require the helm to control the mainsheet as well as an additional control line.