Metal prongs(short and long) for GROOVYPETS T600, T720, GP330,F300 wireless fence, EASYPET EP-380,KOOLKANI KK360, KK9000 Aetertek AT-211/GT-211, AT-211D or old model AT-216S,AT-216 350/550,AT-918,AT-919. Can fit any other brand models if they use the prongs with the same  specs below: 

Length: short prongs 13mm/1/2 inch; long prongs 18mm/3/4 inch. 

Diameter of the screw hole on prongs: 3mm/slightly smaller than 1/8".

These prongs does not fit GROOVYPETS models with bone-shaped receivers. Does not fit  Aetertek AT-216D,AT-919C,AT-918C. 

Free USPS 1st class mail or Low cost delivery via USPS Priority Mail or EXPRESS MAIL. Buyers will receive an email with tracking info immediately after order is processed. International buyer will receive your order typically within 10-14 days via USPS 1st class Mail or 7-10 day via Priority mail or 5-7 days via USPS International Express mail.