Hand-operated brakes for bending sheet metal; hand-operated sheet metal bending brakes; stands for hand operated brakes for bending sheet metal; two-way cutting tools for hand-operated brakes for bending sheet metal; parts and accessories for use in connection with hand-operated brakes for bending sheet metal, namely, concrete trowels, safety cutters, hand-operated shears, masons' trowels, tin shears, and trowels