- 1 inch (26 mm) I.D. opening
- 18 inch length
- with pullback spring
- available in 3 sizes with metal end
These bolus guns are great!!,...... but,... I advise very strongly that you attach a couple of feet of good thin rope or baler twine onto the handle loops. I nearly lost one of these down a cows throat and was barely able to catch it before it went down too far. She wasn't that big of a bossie either.