substantially square stop shoulder 28 at the end of shank section 22 adjacent to the pin break groove 24 the sleeve has a hollow clamshell shaped sleeve head 32 formed at its outer end between the blind side end 18 and the sleeve head the sleeve 12 is of uniform outer diameter and has a smooth internal through bore 30 of uniform diameter in the illustrated embodiment the sleeve head 32 is of the countersink style and has a conical undersurface 34 the sleeve head terminates in an outwardly facing end wall defining a generally conical truncated raised abutment 36 centrally apertured by a sleeve head through bore 38 coaxial with the sleeve bore 30 the first shank section 22 the breakneck groove 24 and an inner portion of the second shank section are contained within the sleeve 12 while the second shank section 26 of reduced diameter extends through the sleeve head bore 38 and terminates exteriorly to the sleeve 12 a series of annular lands 42 and pull grooves 40 are roll formed on the exterior portion 58 of the second shank section 26 roll forming results in metal displacement such that when a thread annular groove or the like is rolled into the part the crest of the annular land grows in diameter by approximately the same amount as the root or groove diameter decreases it is therefore well understood in the art that rolling is done in a pitch diameter 44 indicated in dotted lining in fig1 which is approxiamtely one groove height less than the desired finished outside diameter of the rolled section i e the land diameter 42 in the fastener of fig1 the sleeve bore 30 the first pin shank section 22 the sleeve head bore 38 and.