The Astro Pneumatic 1421 Ergonomically Designed Micro Riveter comes with 4 nosepieces: 3/32" (2.4mm), 1/8" (3.2mm), 5/32" (4.0mm) and 3/16" (4.8mm), Riveter can pull aluminum rivets up to 3/16" (4.8mm). Round knurled nosepieces design eliminates the need for other tools to change nosepieces. Locking nosepiece structure design helps prevent loss of nosepieces. Outer sleeve with adjustable working stroke. Jaws are made of Cr-Moly Steel for extended tool life. Ergonomically designed for user"s comfort. International Patents Pending. SPECIFICATIONS: Maximum Stroke: 7mm, Maximum Working Stroke: 5-6mm, Maximum Capacity: 3/16" (4.8mm) Aluminum Rivets, Length: 8" (200mm),Weight: 1.15lbs (520g).