Abstract: Metallic channel members hold forms for making pads, sidewalks, foundations, headwalls, and other structures. In a first embodiment, a channel member of linear configuration has a width that tightly receives abutting forms and has sidewalls of differing heights. In a second embodiment, one of the sidewalls converges toward the other and abuts a form along a line of contact. In additional embodiments, a pair of metallic channels are hingedly interconnected to one another or are fixedly secured to one another at a predetermined angle such as ninety degrees. In the single channel member embodiments, a bottom wall of the channel member may have a transverse bend formed in it to facilitate wheelchair ramp construction, and in the embodiments including a pair of channel members, one member of the pair may be oriented at a predetermined angle such as five degrees relative to the other member of the pair to facilitate the construction of inclined wheelchair ramps.