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Dental Heat Resistant Stainless Steel Sr144 Bearing Fit NSK High Speed Dental Handpiece Repair. Full 440C stainless steel structure, double shield design, dustproof and durable. P4 (ABEC-7) high precision, stable rotation, suitable for daily clinical high-speed operation. Heat resistant and autoclavable, adapt to regular dental high temperature disinfection environment. Cost-effective replacement parts, widely used for repair of various brand dental handpieces.