Jupiter Magnetic Hoppa Grids a simple and effective device for removing tramp iron of both virgin and reground plastics as used in injection moulding machines. They prevent damage or blockage of valuable moulding or extrusion equipment resulting from build-up of ferrous metal contamination. Easy to install and no fixing or bolting, simply rest against walls of hopper. Available for Round and Square sided hoppers. The Magnetic Grids are also designed as per customers specifications.