OMAX Dual-bar Boom Stand for Stereo Microscopes A602P Height of pillar: 14-1/2inch (370mm); Diameter of pillar: 1-1/4inch (32mm) Diameter of dual-arm: 3/4inch (20mm); Length of dual-arm: 15-1/2inch (395mm) Total horizontal length: 21inch (530mm); Height of boom stand: 17inch (430mm); Diameter of swing arm: 1-1/4inch (32mm) Solid cast steel base: 10-1/4inch x 8-1/4inch x 2inch (260mm x 210mm x 50mm) 1-year warranty against manufacturing defects