Check the listing for details. 90Pcs 1/4" Compression Sleeves Ferrules, Compression Union Connector. Condition: New. Listed at 27.74 USD. Brass compression kit are primarily used in plumbing and light industrial applications,as well as some home repairs, and their wide range of capabilities makes them a solution for a variety of compression fitting needs.Specification Color: BrassMaterial: BrassSleeves ferrules size: inner diameter: 1/4", height: 6.5mm, outer diameter: 8mm;Insert ferrules size: head diameter: 1/4", total length: 13mm, inner diameter: 3.7mm, pipe diameter: 4mmNut size: inner hole diameter: 1/4", hexagonal width across flats: 12.7mm, height: 11.5mmPacking list: 30Pcs Insert Ferrules ,30Pcs Nuts ,30Pcs Sleeves Ferrules AdvantagesMade of brass material, it is durable, corrosion-resistant and not easy to rust, and can be used for a long time. The brass compression kit is easy to disassemble and can be re-assembled many times to ensure a tight fit.