AccessPost Size 1 Red 10/Pk. Passive Retreatable Posts Refill. Prevents high apical stress by countersinking into the tooth. With superior retention of core material. Effectively resists core material retention. Ensures high shank retention by locking in post cement. AccessPost is a passive post with compact walls and a hollow tube design that includes undercut features of the head and shank for added durability, retention, and support. By countersinking the post into the tooth, there is the prevention of great apical stress and outstanding core material retention.