Strengthen Lobster Claw Clasps, Solid And Durable. 1.5 mm-7 mm Wide, 16-36 Inch Length, More Options To Choose. The chain length is the length of the chian plus the length of lobster clasp. You could choose length according to the picture of model's wearing. The neck circumference of the model is about 15.7"(mens) and 12.2"(women), and the specific wearing situation still depends on your own neck circumference. High Polished Shiny Smooth Surface, More Comfortable To Wear. Quality Stainless Steel Built, Keep Color Forever. If possible, you could use tap measure to make a circle around your neck for comparison to know which size is your style. If you have any problems you could contact us no matter before you buy it or after you received it. Monily Square Rolo Chain Necklace Stainless Steel Round Box Necklace for Men & Women