Comprehensive 419-piece rubber seal O-ring set, Ring Set 1, neatly arranged in a practical plastic case. Designed for sealing connections in car air conditioning, air pipes and intake systems. Material: NBR nitrile rubber, resistant to acids, petrol, heat and oils. Sizes: inner diameters from 4.4 mm to 38 mm. Key benefits - Ready-to-use sealing solution for automotive and maintenance tasks - Durable NBR material reduces risk of leaks in harsh environments - Organized case makes it quick to find the right size and speeds up service Use scenarios - Replacing O-rings in car air conditioning lines during service - Sealing air intake hoses and pipe connections during maintenance - General automotive repairs that require standard size O-rings in the 4.4-38 mm range Why it stands out - Wide size range covers common automotive sealing needs - Reputable NBR material with resistance to acids, petrol, heat and oils - Compact, organized storage in a plastic case for easy transport and inventory management