Laser B1 20W can cut through 15mm Pine, 8mm black acrylic, and even 0.1mm stainless steel in one-pass, 20mm basswood and 35mm black acrylic in multi-passes. With the most cutting edge laser coupling technology, Laser B1 20W has a thinner and longer focal length(50mm), yet stronger laser beam, which increase the cutting capability 20%+ stronger comparing to other 20W lasers.