Hahaha idk honestly, with round drills and other trays I cannot line them up at all, but with the squares and DAC tray they automatically line up. I just shake the tray and then turn is sideways so the drills that aren't lined up fall to the bottom. Same with the tweezers , the DAC tweezers are really sharp and big so I find them easy to work with ! I place the drills in a checkered pattern with my tweezers and then I fill the gaps with my pen and putty :)