Features:- Multi-Usage - J Shape Steel Sliding Kit includes 12 pcs of rollers with bolts, made of solid carbon steel & POM, providing sturdy & smooth sliding for you to turn your normal door into an innovative sliding door; ideal for cabinet, closet, bookshelf closet, etc- Durable & Smooth - With powder sprayed solid carbon steel & POM rollers for rust & corrosion resistance, ensure a long lifespan; 8.8 grade M10 bolts with high tensile strength can offer max load capacity of each roller up to 132.28 Lbs; With 6002Z bearing for reducing friction to slide smoothly & quietly- Compatibility - With 2 sizes of bolts including M10x55 & M10x60 fit for door thickness from 1 3/8" to 1 9/16" or 1 9/16" to 1 3/4"; Suitable for wood walls and concrete walls, great for interior doors- Easy to Install - Easy to install by mounting the door onto the sliding rail and securing the stoppers with an Allen-wrench (Sliding rail & wrench are Not Included)- What You Get - 12 pcs rollers, 24 pcs M10x55 bolts for 35-40mm doors and 24 pcs M10x60 bolts for 40-45mm doorsSpecifications:- Each Overall Dimension(HxDxW): 11 1/2" x 2 3/4" x 1 15/16" (29.2 x 6.95 x 5 cm)- Each Wheel Size(Dia.xW): 2 3/4" x 1 1/2" (6.95 x 3.8 cm)- Each Wheel Inner Diameter: 1 3/16" (3 cm)- Each Screw Hole Pitch on Door Clamp: 3 9/16" (9 cm)- Each Weight Capacity: 132.28 Lbs (60 kg)- Fit for Door Thickness: 1 3/8" to 1 9/16" or 1 9/16" to 1 3/4" (3.5 to 4 cm or 4 to 4.5 cm)- Wheel Style: J Shape- Material: Carbon Steel, POM- Bearing: 6002Z- Total Net Weight: 29.1 Lbs (13.2 kg)Package Contents:- 12x Rollers- 24x M10x55 Bolts for 35-40mm doors- 24x M10x60 Bolts for 40-45mm doors- 6x Manuals- Package Content:Notice: - The door and track in the picture are NOT INCLUDED. They are only for demonstration.