Comparison : Item # Z74F0145, Square Head Set Screws Cup Point, National Fine, Case Hardened (9/16"-18)
Item # Z74F0150, Square Head Set Screws Cup Point, National Fine, Case Hardened (9/16"-18)
Item # Z74F0155, Square Head Set Screws Cup Point, National Fine, Case Hardened (9/16"-18)
Item # Z74F0160, Square Head Set Screws Cup Point, National Fine, Case Hardened (9/16"-18)
Item # Z74F0165, Square Head Set Screws Cup Point, National Fine, Case Hardened (9/16"-18)