This is the Standard Gripper Kit B, a simple and durable robotics kit that is great for getting a grip on pretty much any robotics project! Designed for use with any standard size Hitec or Futaba servo, the gripper kit is easy to assemble and requires only a Phillips Head Screwdriver. This Standard Gripper is capable of opening an impressive 6″ wide max, has an overall body length of 5″ long with a 1.3″ wide servo housing body, and offers 6-32 mounting thru-holes along the edges of the servo housing.