More info The Cal Bookend is comprised of two steel rods, which elegantly bend across each other and are locked into place by a single bolt. Named for its resemblance to the caltrop—a rudimentary antipersonnel weapon—but in this case a tool of warfare has been redeployed as an object whose purpose is to literally uphold knowledge.Learn more about the story behind the Cal Bookend here . Specifications Pair of 2 Carbon Steel w/ Nickel Plating or Black Electroplating Rubber feet prevent sliding Assembly required, assembly instructions included 7.75" H x 6" W x 4.5" D 2 lb 3oz each Designed by Revision for Craighill