The SIMPLEX series 3704 is equipped with copper inserts on either side. Representing the hardest insert in the SIMPLEX selection, this insert (series 3804) produces extremely high impact forces but in a way that is gentler compared to a steel hammer. It is the replacement for a conventional copper hammer. The black, reinforced cast iron housing provides for greater stability thanks to the enlarged wall thicknesses and struts. The increase in weight ensures greater impact force. Extremely rugged and durable, the fibre glass handle offers exceptional break resistance. It is shaped ergonomically and includes a non-slip handle. It possesses a smooth surface and is inorganic (non-sensitive to moisture). In line with the smart SIMPLEX principle, all components are replaceable and can be retrofitted. This translates to savings in both money and resources. This version is available in sizes D30mm and D40mm.