Vessel Bit Holder Anti Fatigue Mat Specification item model symbol Specification Specification item model symbol Specification information type B Standard type air cushion tube inner diameter 40 tube inner diameter 40mm Types of port screws Rc cylinder stroke 500 Cylinder stroke 500mm Stroke adjustment unit symbol Left: no unit Specification item model symbol Specification information With auto switch D With auto switch installation support B Basic type tube material aluminum tube tube inner diameter 40 tube inner diameter 40mm Types of port screws Rc cylinder stroke 150 Cylinder stroke 150mm Cylinder additional symbol No bellows