Adjustable insert for use with concrete or steel

An adjustable insert for use with concrete or steel, comprising:

• (a) an elongated plate having inner and outer surfaces and having a slot of uniform width extending along a longitudinal axis of said plate, said elongated plate being further characterized by a plate length and a plate width;
• (b) an elongated body having first and second closed ends, a pair of closed longitudinal sides defining a space of uniform width wider than said uniform width of said slot, and an inner side substantially perpendicular to said closed ends and to said closed longitudinal sides and substantially parallel to and spaced apart from said elongated plate, said elongated body being attached to said inner surface of said elongated plate, said elongated body further having an exterior body length shorter than said plate length and an exterior body width narrower than said plate width;
• (c) said inner side of said elongated body having an opening therein wider than said uniform width of said slot;
• (d) anchoring means attached directly to said elongated plate for anchoring in concrete;
• and
• (e) structural attachment means received in said opening of said inner side of said elongated body and slidable between said longitudinal sides and between said elongated plate and said inner side of said elongated body, said structural attachment means further being sized so as to prevent passage of said structural attachment means through said slot.