The Wear-Resistant Ring 86736311 improves the fit between the front guide and shank in HC25 Hydraulic Rock Drills, reducing wear on both components. Generic wear rings use soft materials that wear within 800-1000 hours, increasing guide and shank replacement frequency. This OEM ring features a tungsten carbide coating (≥0.08mm thick) that improves wear resistance by 50%, maintaining a precise fit between the guide and shank. It extends the front guide’s lifespan by reducing friction, requiring replacement only when severely worn.