Features: These window lens is fit for atomstack M50 laser module, XT30S40 module and suitable for laser module of A10Pro/S10Pro/X7Pro laser engraver. Replacement Method: Remove the current glass kit by unscrewing counterclockwise, screw the new glass kit up clockwise. Fine quality, durable to use. What You Get: 2pcs Window Lens. Any problem, please contact our store. Honor to serve you. Specification: Mode: 10W Laser Module Window Lens Quantity: 2pcs For: 10W laser module, atomstack A10Pro/S10Pro/X7Pro, M50 laser module, XT30S40 laser module Packing List: 2 x Window Lens Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin