Hinge have no backlash or free play and minimal spring back. Friction elements are spring steel. Corrosion protection is available. Please inquire regarding hinge conductivity. Shafts rotate 360 degrees. Hinge feature constant torque over life (30,000-plus cycles typical). Hinges are assembled from inventory for fast delivery with no tooling charges. Application: laptop and notebook computers, flat panel and LCD display mounting and positioning, medical equipment, protective covers, access panels, office equipment, control panels, cameras, computer peripherals, anything that has to pivot and stay put.