Ingrassatori DIN 71412: 1 М6X1 Straight (length - 13mm) - 100 000 pcs. 2 М10X1 Straight (length - 18mm) - 50 000 pcs. 3 1/8"-27NPT (length - 18mm) - 100 000 pcs. Type SAE 4 1/8"-27NPT 45* (length - 23mm) - 60 000 pcs. Type SAE 5 1/8"-27NPT 90* (length - 19mm) - 40 000 pcs. Type SAE Zinc coating -6-9mkm. The hardness of the head - 500HV. supplier should heve certificate TS 16949