Abstract: A structural detailing tool including relatively movable first and second blades disposed at right angles to one another and both incorporating straight edges used as tracing guides. Lock structure is employed to lock the blades in different relative positions and a movable tray is mounted on one of the blades to support a calculator and a data card.

Abstract: A wrap around type tool with flat, right angled, rectangular blades, one perpendicularly aligned with the other, designed for bordering adjacent sides of a work piece. Each blade having perpendicularly paralleling outer straight edges, a centrally located slot providing for perpendicularly paralleling inner straight edges. Said edges, selectively chosen and in conjunction with a measuring tape, aiding the user in marking delineations for the placement of components in the fabrication of a buildings framework. The afore mentioned measuring tape is a locking type, and placed in a fixed position, on the surface of the working place, contiguous to the work piece. In placing the inside face of the horizontally oriented blade atop a work piece and the vertically oriented blade adjusted to fitting the blades end stay lightly touching the measuring tape. Moving in a comfortable direction, the user proceeds along the work piece, marking component placement location, component size and description.