Herkules Glass extra door kit. Herkules Glass is a sliding door system for use with single room dividing doors. The system runs on wheels on ball bearings attached to glass clamps. The innovative clamping system ensures no drilling or cutting of glass is necessary, making installation easy.Max door weight: 100kg, door thickness 8-12mm, max door width: 1040mm.This kit allows you to add an extra door to the existing track system. No track included.This item is delivered direct to you from one of our suppliers, please see our Terms & Conditions for details.