Invisible Connections supplies the concrete construction industry with ‘unseen’ telescopic connection systems for stairs and landings, beams and columns. We are also specialist manufacturers of the FERBOX reinforcement continuity system, to application requirements.

All Invisible Connections’ products are designed to meet industry demands for improved safety and construction efficiency, whilst ensuring cost competitiveness. Our Product Selection Guide provides an at a glance overview of all our products, plus key features and benefits.

Our telescopic connection systems are endorsed by European Technical Approvals (ETAs). They comply with relevant Eurocode standards and are individually CE marked. FERBOX is endorsed by CARES Technical Approval and is manufactured under a CARES Quality Management system to the ISO9001 standard.

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Construction sectors

Latest updates

Tall Buildings Conference 2019

Invisible Connections to exhibit at the Tall Buildings Conference on 30 April 2019 in London

16 Apr 2019

Tall buildings present unique challenges in terms of both design and construction. Their sheer scale demands that particular attention is paid simultaneously to strategic and detailed issues. The Tall Buildings Conference is intended to assist engineers in understanding the common challenges associated with transferring standard engineering principles and knowledge from low-rise structures to tall buildings. […]

Study finds using RVK 101 telescopic connectors instead of RSAs delivers 33% cost savings

3 Apr 2019

A recent report evaluates the costs of materials and labour to support precast concrete landings off core walls. Comparing costs for RVK 101 connectors and rolled steel angles (RSAs) show that telescopic connectors yield one third (33%) reduction in costs with only one fifth (20%) of labour. Furthermore, robustness anchorage is inherent to the layout […]


Thank you for sending the calculations and installation advice. The new calculation software looks great. Very clear, user friendly and with more design checks then the previous version. It’s a pleasure to see how you are constantly improving.

Stefan Pauceanu, Senior Structural Engineer, Ground Construction Ltd