Chassis size 1-1/4"H x 2-1/4"W x 4-1/4"D for project use. Interlocking construction and engineered to eliminate hard to get at places. Maximum panel area exposed for component mounting. Easily fabricated into amplifiers, junction boxes, oscillators, etc. The rugged sturdiness of the final assembly will amaze you. Simple and speedy to assemble, with only two screws to put in place. All screw fastenings are punched and tapped. Hardware included.