- 1/2 inch (13 mm) I.D. opening
- with pull back spring
- 18 inch length
- available in 3 sizes.
The quality of this particular bolus gun is REALLY great, ...But do not let the description mislead you. It is by NO means small. If you are looking for a gun to use on goats or young sheep & Pigs. This will NOT hold the sized cap you would likely be using at all! Got these for my Nigerian goats for copper bolus either the 2gm nor the 4gm can stay in the tip even tho it's supposed to have the clip that helps this. ***Also note it is 18" long!!! That will go in one end and almost out the other! You would spend more time making sure you don't push too far & causing pharyngeal or esophageal injury. Unfortunately, shipping for a 24 oz package was 8.50 a minimum of 10.00 restock fee for a return plus postage again. I love Hamby and this product, just trying to save another small farm animal owner the hopes and return problems. THIS WILL NOT WORK for goats! Still searching...