Thanks Travis299....

Are they definitely Hawke Tactical medium?

According to Hawkes website diameter of my 2-7x32 is 46mm, and diameter of your 4-16x44 is 51mm.... I'd worked out that with the Hawke Tactical medium I'd only have 1.7mm between AO ring and rifle, gap on yours looks to be a lot bigger?

Aside from gap/size difference good to know they hold tight - thanks!