Heavy-duty air/hydraulic riveter with newly designed aluminum forged head can hold up under demanding continuous use. Aluminum forged head allows for continuous full operating power and less internal wear. M-4 can set rivets from 3/32 in through 1/4 in diameter in all alloys, and also has the capability of setting 3/16 in and 1/4 in T-Rivets/Klik-Split®, Klik-Lock™ and all other structural blind rivets (special optional nosepieces may be required). The recommended airline pressure is 85-95 PSI.