Applications :A pratical,versatile means of clamping and holdin work in a vertical position for layout machining,and inspection ,or for a vertical reference .Also ideal for use as time-saving ,reusable fixture components. General Specifications: Heavily ribbed for strength and rigidity .The sides and ends are machined finished. Tolerances:The two ourside working surfaces are precision ground flat&square . Options: Sides and ends can be precision ground.Matched pair also available.Matching refers to overail dimensions only