Bosshead - Popular, powder coated finish-EIS-CH0663A offers a thoughtfully designed, durable resource for hands-on learning. EISCO Boss Head, Die Cast Alloy, Powder Coated Finish, rods up to 16mm Includes: (1) Boss head For use with laboratory stands, this popular boss head is made of die casted alloy with a powder coat finish. It accepts rods up to 16mm in diameter at a right angle to one another. Metal thumbscrews allow for adjustment. Measures approximately 11 x 3 x 3 cm in size.