These rollers are suitable for pulling the pilot line with a helicopter. The pilot line is automatically placed into the (central) wheel. Special guides ensure proper positioning of the line during the pulling operation. The wheels are made of aluminum alloy and mounted on ball bearings. The side wheels have grooves lined with a neoprene ring. The central wheel has grooves made of wear-resistant, replaceable nylatron. The frame is made of galvanized steel. The rollers are supplied with a fixed connection. Grounding devices or complete conductive pulleys are available upon request.