Brand: FATH Item: Milling connector Series: 15 Series and 40 Series For Use With: All 1.5in, 3in, 40mm and 80mm profile T-slotted rails Material: Zinc plated steel Color: Silver Manufacturer Part Number: 099D0840M0530 Slot Size: 8 FATH milling connector, silver, zinc plated steel, slot size 8. For use with all 1.5in, 3in, 40mm and 80mm profile T-slotted rails. Manufacturer part number: 099D0840M0530.