The D Series Sash Balances from Era combine stainless steel spiral rod torsion and tension springs to produce a complete balancing device capable of maintaining the equilibrium of a sash window at any point in the travel of the sash. These D6 models are designed to suit a sash weight range of 14.5kg – 18.1kg. All Era sash balances have semi flexible tubes which enable ease of use during installation or replacement and all ‘D’ type balances are adjustable within their weight range to suit actual glazed sash weights using a special adjustment tool. They are sold as a pair and supplied complete with 10 year manufacturer’s guarantee. Please note that these balances are not supplied tensioned.