Allen Dual Arm Mainsheet Jammer Select (See Table Below):AL-5166-DUAL-A DUAL ARM SWIVEL JAMM+2160 BLK - EACH Three styles of track are

Three styles of track are available drilled

Manufacturer Part Number: D3100022

Harmonic distortion typical: < 1%

Manufacturer Part Number: 22HSV

Allen Dual Arm Mainsheet Jammer Select (See Table Below):AL-5166-DUAL-A DUAL ARM SWIVEL JAMM+2160 BLK - EACH Three styles of track areDual arm mainsheet jammer. Allen have spent many hours of research and development with various boat builders to perfect the angle and height of the cleat to optimise mainsheet jamming. Innovative light weight construction. Dual ball race for maximum efficiency. Optional click stops limit swivel rotation. Line snags virtually eliminated. Standard and high cleating angles to suit all. A groove had been created in the arm for the location of the ball