4374 Upper Sleeve (Package of 5 Pieces) Upper Sleeve (pack of 5) Fits: APT-133, 1133, 133CN, 1133CN, 633 Rivet Busters Fits: CP-4181, CP-4608, CP-4611 Rivet Busters Fits: IR-9001, Toku-RB-110, RB-110D, RB-90, Kent-A-90, Atsco RB08, RB11 Sulalir MRB-08, MRB-11 and all other Jumbo size rivet busters