【4 Gear Adjustable Speed】The caulking gun has four gears of variable speed, the pushing speed can be adjusted from 0 to 196mm/min. The variable trigger can also control the flow rate, The corresponding flow rate can be selected according to different needs, which can better control the flow of glue. 【Automatic Rebound Design】When you release the trigger, the toggle will automatically rebound to prevent excess glue from dripping out. Anti-rebound technology saves even more time and effort. This caulking gun is suitable for all common 10oz/300ml sealants 【Widely Use】Suitable for applying glass glue, caulking, sealant etc. This caulking gun is suitable for all common 10oz/300ml sealants. Widely used for filling, sealing and repairing some narrow gaps in walls, windows, balcony doors and windows, shower/wash basin installations etc. 【LED Light Design】 With an 450LM LED light, provide light for use in other dark environments. No need to worry about power outages when using in the dark!