Sprenger Black Stainless Steel Prong Collar with Click Lock and Martingale Chain Size:3.25mm - 23" (Fits 21" Neck) To upgrade an existing ET-300

To upgrade an existing ET-300 system to a finger trainer

3 G-hook loops on either side

Velcro® attachment on both sides

This tool is designed as a passive barrier only and is not to be used to hit the dog

High power output (1-100)

Sprenger Black Stainless Steel Prong Collar with Click Lock and Martingale Chain Size:3.25mm - 23" (Fits 21" Neck) To upgrade an existing ET-300Made in Germany from anodized stainless steel Quick release Click Lock buckle Finished with Martingale chain Available in two gauges Famous Herm Sprenger quality [split] This collar from Herm Sprenger Germany incorporates both the ease of use of a quick release Click Lock Buckle and the functionality of a Martingale chain in the same collar. Sprenger has replaced one of the end links on the assembly chain with their Click Lock buckle making for easy