Heat treated to SAE J534 specification with a hardness at the grease end of at least 83 on the Rockwell scale. The grease nipples are fitted with heat treated springs for extended life. The steel grease nipples are zinc plated with a plating thickness of 0.0002 "(5 microns) in accordance with SAE J534 specification and have a guaranteed salt spray life of over 72 hours against red rust. The plating complies with the relevant European standards. Set composition: Straight grease nipple: 6x100 20pcs. 8x100 10pcs. 10x100 10pcs. 45° grease nipple: 6x100 15pcs. 8x100 10pcs. 10x100 10pcs. Grease nipple 90°: 6x100 15pcs. 8x100 10pcs. 10x100 10pcs.