Carson MagniFree 2x Hands-Free Magnifier with 3.5x Bi-Focal Spot Lens (HF-25) Hands-Free 2x Power Magnifier with a 3.5x Spot Lens and an Adjustable Neck-Strap Crystal Clear, Distortion-Free Acrylic Lens | Lens Diameter: 4.0 inches Perfect Magnifying Glass for Needlework, Crafts, Hobby, Model Building, Fly-Tying and other Tasks. Magnifier has a Lightweight, Compact and Ergonomic Design Backed by Carson's Limited Lifetime Warranty