Astro 1423 13-Inch Heavy Duty Hand Riveter Patented structure increases power and reduces shock Shorter handle with double compound hinges that maximize leverage Shortest long arm riveter which can operate up to 1/4-Inch (6.4mm) stainless steel rivets. A one-piece collet case eliminates the need to adjust the tool when changing rivet diameters. One of our most versatile and powerful hand riveters, taking the hard work out of setting large diameter blind rivets Includes 5 Nosepieces: 1/8" (3.2mm), 5/32" (4.0mm), 3/16" (4.8mm), 6.0mm and 1/4" (6.4mm)