Package includes: 2x floor guide, 4x screws, 4x screw expansion fixator. Size (L x H x B): about 4.5 x 2.5 x 4.5cm. Quality material: using high quality hard carbon steel and black powder coating, durable, safe and environmentally friendly. Simple installation: just need 2 screws to align the interface of the bottom plate and fix it, which is easy to install and does not damage the floor. Application: This is an adjustable floor roller guide that can be used on entry doors and slotted doors. The maximum thickness of the slotted door is 1"/2.5cm; the maximum thickness of the slotted door is 1.38"/3.5cm. Product Description Products Description Specification: Material: Carbon Steel Size (L x H x W): approximately 4.5 x 2.5 x 4.5 cm. Color: Black Function: 1. With high quality hard carbon steel and black powder coating, durable, safe and eco-friendly. 2. You only need 2 screws to align and fix the floor panel interface, which is easy to install and will not damage the floor. Package: 2 x floor guide, 4 x screw, 4 x screw expansion fixator. Note: Due to the manual measurement, please allow a slight deviation of measure.