Fig 01 Silver Arm. Briton 996 Series is a range of closers with an integrated electromagnetic hold open mechanism. Typically used on fire rated doors where the hold-open or swing-free feature is required either in high traffic areas for convenience, or in situations where it would be difficult to satisfy the maximum opening force requirements of Part M of Building Regulations.. SE - silver finish & black arm. Non handed. Maximum door width 930mm & weight 60kg application 01. Maximum door width 830mm & weight 45kg application 66