Suitable Needles:Any Standard , or Arrow C121, T121, Y121, T131, C131, B131. Suitable Tag Pins: Any 50 pcs Standard Tag Pin, Standard Hook Pin, Standard `V' Pin, Standard Ring Pin. Fabric Piercing Diameter:- 2.0mm. Maximum Thickness Of Fabric:- 10.0mm. The best tool for any tagging application. price tag gun with extra needle and 2000x 2" barbs . The barbs are easy to use, attaches bar code and price tags to clothing. Always install the protective cover over the needle when not in use. The steel based needles are in highest quality . Compatible with regular barbs, attachments and hook attaches.