The nylon inserts (Series 3508) have a hardness of approximately 73 Shore D, making them very hard. These white polyamide inserts offer outstanding impact properties and guarantee maximum strength with the highest durability. They are made from extruded, extremely homogeneous material. Compared to injection-molded plastic inserts, they are significantly more wear-resistant and robust, and they do not splinter even at low temperatures. They withstand high impact forces of recoil-free soft hammers. Additionally, they are oil and grease resistant and are used in SUPERCRAFT soft hammers, SUPERCRAFT striking hammers, punches, and mallets. These inserts are available in sizes D10mm to D100mm. Product features: SUPERCRAFT striking insert nylon (polyamide). White. Hard. Very wear-resistant. No splintering even at low temperatures. Oil and grease resistant. Available in sizes D10mm to D100mm. Material: nylon insert, white, hard, very wear-resistant, no splintering (even at low temperatures), low noise for very high impact force.