AVAK MaxDuty Swivel TRIO - 3-in-1 360&deg; Heavy Duty Swivel Head Fastening Tool for 1/4" Rivet, 3/8" Blind Rivet Nut and 5/16" Rivet Stud. (Standards UNC) 3-in-1 360 Swivel Head Tool for easy access to hard to reach places Heavy Duty: use up to 1/4" rivets, 3/8" blind rivet nut and 5/16 rivet studs in all materials QuickSwitch: 3 steps for functional dismount or assembly Use both metric/standard fasteners with mandrel expansion sets. Packaged in a convenient case.