K2 Nano Mini Electric Drill, Precision Rotary Tool Kit | 20 Bits with Storage Ca

K2 Nano Unboxing. In the case of L mode, a 3.2mm drill bit can drill 64 holes in a 1.6mm thick aluminum shell. In the case of H mode, a 3.2mm drill bit can drill 42 holes in a 1.6mm thick aluminum shell.