2 4x 6.6x Clip-On Eyeglass Eye Loupes Watchmakers Tools. Double Lens Clip On Magnifier. This is a new double lens clip on magnifier. These attach to your eye glasses. Each lens is 3.3X and when combined they are 6.6X. The 3.3X lens has a focal distance of 3 1/2" (89 mm). Combined the 6.6X lens has a focal distance of 1 1/2" (38 mm) 4X Clip On Loupe. This is a new 4X clip on loupe. Great for jewelers and viewing stamps, coins, beads and gems. It clips on to your eyeglasses so you can work hands free. It has a focal distance of 2 1/2" (63.5 mm). We work hard to update our descriptions and pictures of our merchandise. As part of a process of ongoing innovation by our suppliers, newer versions of the item shown may be shipped before we are able to complete an update. As a result there may be a slight variation in color and design.