LASER TREE 40W Laser Module, 5W Optical Output Power Laser Cutter Module w/Metal Air Assist, Compatible with Laser Engraver Laser Cutter Machines CNC, 45mm Fixed Focus 12VEXCELLENT ENGRAVING & CUTTING ABILITY - The 40W laser module engraves 304 stainless steel up to 800mm/min at a 45mm focus length. The 5W optical laser cutter module is capable of cutting through 5mm thick plywood and 5mm thic...