Product parameters: 40 packers, four colors to distinguish 4 different heights of gaskets, 1.5mm 3mm 5cm 10mm Product material: Shims are made of hard plastic material, resistant to high temperature, not easy to deform, strong load-bearing capacity, sturdy and durable Multi-function: Spacers can help fix and adjust the flatness when installing doors and windows, and is very suitable for dry lining, cladding, glass and frame fixing Non-slip and practical: Just align plastic packers where you need to leave a space, the gasket can be flexibly combined and superimposed, and the surface texture is not easy to slide Use scenario: 10mm spacers are suitable for auxiliary leveling and fixing when installing doors and windows, derailment, tiles, and floors, suitable for home installation, DIY enthusiasts and professional maintenance personnel