I would also offer a comment on their great service. Last fall I was flying back from a gun show. had the Skeets bore guage in my checked luggage, wrapped in bubble wrap. When I got home I found that the folks with TSA must have been very curious or bored. They had used a small punch and punched the plunger and balls out of the housing, not on just one head but both heads, then gathered up the balls and plungers and put them in one of their " 1 Qt clear plastic bags".. I sent it all back to Skeets in OK, No problem, no charge, they put it all back together