A construction system includes an elongated connection stem with a central member having a uniform first transverse dimension and opposed integral end members, each having a uniform second transverse dimension greater than the first, each end member having a longitudinal slot extending from a tip end to the central member and an attachment member having a central through bore slightly smaller than the second transverse dimension. A cross section of each end member is similarly shaped to the central through bore and slightly larger than the central through bore and a cross section of the central member is similarly shaped to the central through bore but of smaller size than the central through bore. In one instance, the attachment member is fittingly received on either of the opposed end members and, in another instance, the attachment member is slidably received on the central member.