1 ) RIVET MS SNAP HEAD 20X100 MM. 2 ) HOT FORGED SOLID STEEL RIVETS DIAMETER ( M [ HOT FORGED SOLID STEEL RIVETS DIAMETER ( MM ): 20, LENGTH ( MM ): 76. SPEC.: ( SNAP HEAD TYPE ) IS: 1929/ 1982 ( REAFFIRMED 2001 ) 1ST REV. WITH AMNDT. NO. 1 TO 3 MATERIAL AS PER IS: 1148/ 1982 ( REAFFIRMED 2004 ) WITH AMNDT. 1 & 2 3RD REVESION. ]