• Made with solid zinc alloy, SUS304 stainless steel, and brass, with a plastic cover for added durability. • Roller wheels with a diameter of 23 mm and a thickness of 5.5 mm. • Compatible with glass thickness of 4-6 mm and glass opening holes larger than 9.8 mm. • Easy DIY installation: simply disassemble with a screwdriver and replace the rollers on glass doors. • Includes 4 shower door rollers: 2 upper and 2 lower. • Product dimensions: 3.5 cm wide, 3.2 cm high, and 5.5 cm long. • Total product weight: 0.19 kg.