1. Instant Fix for Sagging Wooden Doors - Lift Drooping Doors in Minutes - Heavy-duty 2-inch nylon wheels with alloy axles instantly elevate sagging doors, eliminating friction against floors. Restore smooth opening/closing without costly door replacement 2.Space-Saving Vertical Mount Option - Unlike traditional bottom rollers, our brackets allow side installation in tight corners, while still offering standard bottom setup. 3.DIY-Friendly Fix for Homeowners - Pre-drilled holes & included stainless steel screws let you secure wheels in under 3 minutes. Fits 99% of wooden doors. 4.Double the Strength of Competitors - Reinforced alloy axles & nylon rollers, outlasting plastic models. Rust-proof for indoor/outdoor use. 5.Bonus Furniture Savior - Reuse extra wheels to stabilize wobbly coffee tables, bookshelves, or sofa legs. Silent rolling protects floors from scratches Color: black Material: PTR + Iron Size:5x2cm Package Contents: 4pcs x 2inch Gate Wheels 1 pack x screws Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.