Brand: FATH Item: Screw Series: 15 Series, 30 Series, 40 Series and 45 Series For Use With: All 1.5in, 3in, 30mm, 40mm, 45mm, 60mm, 80mm and 90mm profile T-slotted rails Material: Zinc plated steel Color: Black Quantity per Pack: 10 Manufacturer Part Number: 4ISO7380U,31-1M Head Type: Button head socket cap Thread Size: 5/16-18 UNC x 1in Slot Size: 8/10 FATH button head socket cap screw, black, 5/16-18 UNC x 1in, zinc plated steel, slot size 8/10. Package of 10. For use with all 1.5in, 3in, 30mm, 40mm, 45mm, 60mm, 80mm and 90mm profile T-slotted rails. Manufacturer part number: 4ISO7380U,31-1M.