QUANTITY: SET OF 5 + 1 KEYTHREAD SIZE: 12X1.5mmHEIGHT: 0.85"OUTER DIAMETER: 0.81"INNER DIAMETER: 0.57"SEAT: 60 DEGREE CONICALFINISH: TRIPLE CHROME PLATEDHEAT TREATED STEEL CONSTRUCTION FOR ADDED STRENGTHSPLINE KEY HEX SIZE: 3/4 & 13/16