Unique ``Twistable" Head, rotates 360 degrees for any angle riveting. All-steel construction. Comfortable vinyl grip. Spring-loaded handle for easy rivet loading and ejecting. Extended nose for hard-to-get-at places. Lock clip when not in use. Four nose pieces with wrench. Uses four rivet sizes: 3/32" (2.5mm), 1/8" (3mm), 5/32" (4mm), and 3/16" (5mm). Not for use with stainless steel rivets.