Please check the size carefully before ordering. These are compact door wheels with a 0.9 inch wheel diameter and approximately 1 inch overall height. They are designed for low-clearance indoor applications and may be smaller than standard furniture casters or outdoor gate wheels. Measure the mounting area and required floor clearance before purchase.This 4 pack of low profile caster wheels is designed to provide additional rolling support for lightweight interior wooden doors, bedside cabinets, pull-out drawers, storage boxes and compact furniture. The fixed non-swivel structure moves mainly forward and back, making it suitable for applications where straight rolling support is preferred.The small nylon rollers fit into limited installation spaces while keeping added height minimal. The extended mounting frame can be installed vertically or horizontally depending on the structure and available mounting area. Each wheel supports up to 30 lb when properly installed on a suitable indoor application.For best performance, use these cabinet wheels and small caster wheels on firm, smooth and dry indoor flooring such as wood or tile. They are not intended for standing water, wet environments, thick carpet, soft floor coverings or uneven surfaces.These wheels are intended for normal indoor household use. Do not use them on exterior gates, large outdoor doors or other outdoor structures. Avoid prolonged exposure to direct sunlight, high heat, rain and outdoor weather conditions.The package includes 4 fixed door wheels and 16 mounting screws. Before installation, compare the listed dimensions with your door, cabinet, drawer or furniture project to confirm proper fit and clearance.