Cleco Single & Parallel Balance Arms, Spring Models feature durable ball bearing construction. Cleco Single & Parallel Balance Arms, Air Cylinder Models support tools weighing up to 5lbs for the spring models and up to 10lbs for the air cylinder models. Cleco Single & Parallel Balance Arms, Spring Models also feature post, wall, or adjustable height post mounting. Cleco Single & Parallel Balance Arms, Spring Models are available in single or parallel arms.