Halder Simplex impact insert EH 3203, Ø80 mm. The EH 3203 Simplex impact insert from Halder, made from high-quality TPE-mid, a thermoplastic elastomer, is a medium-hard insert from the Simplex series. This grey impact insert is characterised by appealing shock absorption and minimal vibrations, making it particularly suitable for sensitive materials such as natural stone, tiles and slabs. Compared to conventional rubber mallets, it leaves no unwanted black abrasion, which makes applications even cleaner and more efficient.