About the Product Size in mm Average Weight KG/MTR KG/FT 45 x 30 x 4 2.23 45 x 30 x 5 2.75 0.80 Rolling Tolerances Leg length Sectional weight Length Up to 45 mm : ± 1.5 mm 45 mm to 100 mm : ± 2 mm above 100 mm : ± 2 % 3 mm thickness : ± 5 % Over 3 mm thickness :+5/-3% For fixed length : ± 100 mm