E-Klips Adjustable Ceiling to T Bar Rod Hooks and Double Rod Clip. Rod size 4mm. Rod Lengths 340mm - 340mm. Load 100Kg. Finish, electroplated zinc, generally 8-12 microns thick with chromate coating, approximately 72 hours salt spray resistance ASTM-B117-90, DIN 50021, suitable for indoor, non-corrosive environments.