SE 3pc Jewelers Eye Loupe 10x 30x + MICROSCOPE magnifier The set includes one 10x 21mm chrome loupe, one 30x 21mm chrome loupe and one 20x pocket magnifier The 10x power loupe has a focal distance of 1" (26mm) with 21mm dia lens size The 30x power loupe has a focal distance of 1/2" (13mm) with 21mm dia lens size Both loupes are made of optical glass and protected when not in use by the swing-out chrome plated metal cover The 20x power pocket magnifier measures approximately 1 5/8" long and 9/16 dia,made of optical glass,also comes with a key chain