Specially designed to lock onto any standard 3/8″ vise stem, or choose the powerful suction-cup model for solid mounting on any flat, smooth surface. Allows you to clearly see without distortions small details while tying. It has a flexible arm fully adjustable to any position with a small attachment that permits an easy and stable locking on vise stems. 2X magnification, lens dimensions 80 mm, 350mm flexible arm.