I got all of these on eBay.
Just look up 12, 16, or 24 inch Hemostats. Those will "lock" onto the rodent's tail or ankle very easy.
or search for 12 or 16 inch tweezers.
I Prefer using the long tweezers, even on Jumbo/Colossal rats because sometimes I could not get the Hemostats to instantly unlock when the snakes would slam the rat.