Pony Tools 9424 24" Pony 4-Corner Framing Clamp Kit 24" length plated steel threaded rods; 1/4-20 standard rolled threads (4 rods included with 9424) 4 corners that are high-impact glass/poly-carbonate LEXAN with tensile strength of 16,000 psi 1" x 1-1/4"clamping faces , and 4 plated zinc alloy thumb-nuts; firm-holding, easy-spinning design