Box Floor Centres. Box floor centres are used to support decking Panels and are fully adjustable to accommodate different sizes. LengthWeightNo.1 (1219 – 2286)16.54 kgNo.2 (1829 – 3353)23.88 kgNo.3 (2439 – 4724)31.20 kg Enquire Now kwikstage formwork selflock × Product Enquiry