OMTech Nozzle and Lens 4 piece Kit Powered by American Photonics

Features: APC 4.0” FL: Made specifically for cutting (only for cutting), perfect for thick wood and acrylic material (up to ½ inch thickness) APC 2.5” FL: Suitable for cutting (up to ¼ inch thickness) and decent for engraving APC 2.0” FL: Excellent for cutting thinner materials (up to ⅛ inch thickness) and great for engraving, perfect when you have simultaneous engraving and cutting jobs APC 1.5” FL: Specifically made for engraving (but can also cut paper-thin materials) Air Regulating Valve: Pneumonic device used for regulating air pressure Reverse Alignment Tool + 10 PC of AG3 Batteries + 1 PC of AAA Battery Size: 20 mm (25 mm tube kit) 4 piece kit 18 mm (16.15 mm tube kit) 4 Piece Kit How to pick size? (Please Read Before Purchasing) Normally 80 watt and lower use the 18 mm lens (16.15 mm tube kit). 100 watt and higher use the 20 mm lens (25 mm tube kit). To be precise, you need to measure the bottom tube (diameter of the lens barrel) of your head assembly. That will determine