Available in 1.00 mm 19G Heavy and 0.08 mm 21G light thickness made out of C.R Coil.   Stronger than the old conventional slat 18G=19G Great; 19G=21G Great   When rolled the diameter of the shutter does not exceed 125 mm   Spring requirement totally minimized.   Requires 2% less steel than the old model   More convenience , more strngth & more saving   Fix great Conventional Shutter slat to feel great   Finish industrial primer paint grey color.