Description: 8 different sizes, 180 pieces, use for personal and professional workshops, garages, and plumbing services. Storage case organizer included, convenient to storage. Widely used in automobile, mechanical equipment, engineering machinery, chemical, ship Abrasion resistant, suitable for high dynamic loads. Need to seal, to avoid leakage and make the machines work for long time. Specification: Color: Black Size types: 8 Material: rubber Box size: approx. 21x10.5x3cm/8.3x4.13x1.18inch Package Includes: 1 Set Rubber O Ring