HooAMI Slide-On Pet ID Tags - Custom Engraved Pet ID Tags - Strong and Durable Stainless Steel Material:Stainless Steel Length:6cm(2 3/8");Width:1.6cm( 5/8");Thickness:1.5mm;Hole Size:1.2cmx6mm( 4/8"x 6mm); Collar is not included. Durable,Silent, and EASY TO ATTACH.This tag slides onto single thickness nylon collars with metal buckles. No more dangling tags. Pls kindly check the LEFT GUIDE PHOTO to know how to customize your tag. We offer up to 3-5 lines of personalized laser engraved text. TO ORDER: SELECT SHAPE & SIZE FROM THE ABOVE CHOICES. After selecting shape & size, click CUSTOMIZE NOW to add your personalization details to the tag. You may include up to 3 lines of text on the Front surface. Add to cart ONLY AFTER you have completed with your information.