ST = standard, housing made of aluminium and die cast - steel forged actuating lever, 4 exchangeable nosepieces (2,4", 3,2", 4,0", 4,8 mm • 3/32", 1/8", 5/32", 3/16"), retaining function of the blind rivet through spring closure, plastic stroke cap for positioning/fixation of the rivet, ergonomic soft grip