Helix magnifying glasses are designed to help the short sighted and those doing delicate and detailed work | Scratch resistant lens | Comfortable, ergonomic grip | Protective rim makes it durable and long lasting | Lightweight for portability | Bi-Focal magnifications: 2X with 4X insert for magnifying glass lens | Large lens measures 75mm | Protective rim | Scratch resistant lens | Comfortable, ergonomic grip | Lightweight