2400Pcs Universal Rubber O Ring Assortment Kit In 48 Sizes, Industrial Grade MULTI-SIZE SET -- Overall 48 popular sizes (2400pcs) SAE/Metric orings, inner diameter from min 3/16" to max 1-3/16" (4.5mm to 24.9mm), section from min 1/32" to max 1/16" (0.75mm to 1.55mm). EXCELLENT QUALITY -- Industrial grade nitrile rubber (NBR, Buna-N) material features oil resistance, corrosion-resistant, heat resistant (-40? to 120?), wear and tear-resistant, anti-static. WIDE APPLICATION -- Provide extreme and long-lasting sealing effect when repairing water pipes, faucets, appliances, vehicles, machines, instruments, hydraulics, or pneumatic object. WELL ORGANIZED -- All 2400 o rings are stored in two sturdy transparent plastic boxes with corresponding labels, 1 slot to 1 size design saves you effort in tidying up and choosing sizes. CONVENIENT HOOK -- Extra 4-piece o ring hooks set include straight pick, angled hook, full hook, and 90-degree hook. It will help you to remove o rings and various seals easily and quickly.