Significant quantity: 2 sizes each, 25 spares, o-rings, inner sealing ring for quick couplings 1/4, 3/8 and M22 25 pieces small o-ring size: outer diameter: 14 .0mm; Inner Diameter: 9.2mm; Designed for 1/4 inch and M22 quick connectors 25 large parts: outer diameter: 17.1mm; Inner Diameter: 11.8mm; 3/8" Quick Connect Fitting Water Saving: Save water by reducing leaks with a high-quality O-ring. These are replacement O-rings that will fit many pressure washer wands, hoses and quick connect fittings. Note: Check the size of your o-rings before purchasing. Good quality: made of tear and abrasion resistant NBR rubber; Compatible with many connectors and cleaners, suitable for cold and hot water pressure washers