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adjustable alloys aluminum solder angle applied bar folder bench drills blast furnace brace brass brazing burrs center punch clamped clean coating cold chisel combination square common countersink countersunk curve desired diameter double seam drag edge electric fastening finish flat gauge grinder grinding grooved seam hammer-marked heat hold iron jaws joint lacquer lap seam length mallet mark material measure melt metal bar metalwork mold molding sand molten monkey wrench necessary number of threads oxidation pattern piece of metal pig iron pipe planishing plate proper Punching holes removed rivet head rods round rule sal ammoniac sand scratch awl Select self-tapping shape shear sheet metal shown in Figure shows snips soft soldering copper spelter square stake steel strike STUDY QUESTIONS surface tap wrench thickness thread pipe tightly tool turn twist twisting metal Unit vise wheel width wire