The Sealey 419 Piece O-Ring Assortment Set is a comprehensive nitrile rubber seal collection designed for workshops, garages and plumbing applications. This extensive assortment provides professional tradespeople and serious DIY enthusiasts with a ready solution for seal replacements across a wide range of equipment and systems. Manufactured from nitrile rubber, these O-rings offer excellent resistance to oils, fuels and hydraulic fluids, making them ideal for automotive repair, hydraulic system maintenance and general mechanical work. The set includes 419 pieces across 30 different sizes, with internal diameters ranging from 3mm to 50mm and thicknesses from 1.5mm to 3.5mm, ensuring you have the correct seal specification for most common applications. The O-rings are supplied in a partitioned storage box with interspaced compartments, keeping each size organised and readily accessible. This systematic storage solution helps reduce downtime when searching for the correct seal size durin