T-Bolt, Medium Strength, Steel, Black Oxide Finish, Thread Size 3/4-10, Thread Type UNC, Length under Head 3 In, Thread Length 2 In, Head Height 17/32 In, Head Width 1-5/16 In, Slot Size (In) 3/4 In, Tensile Strength 20, 040 PSI, Rockwell Hardness C25-C34, Meets/Exceeds Grade 5