Material: Brass. Steel, zinc-plated. Extension with Whitworth pipe thread 1/4", suitable for e.g.: - Flange bearings DIN 502 A, DIN 502 B and DIN 503. - Pillow block bearings DIN 504 A, DIN 504 B and DIN 505. - Lubricators. - Drip-feed oilers Unikum and UNI, sizes with R1/4". - Stauffer grease boxes, sizes with R1/4".