Description Product Description Color: gray shower door rollers; Pattern: double shower door rollers. Caster diameter: 23 mm; Width: 5mm. Minimum hole size in glass: 11mm. Suitable for sliding door glass thicknesses from 3 to 6 mm. Material: plastic, BS nylon and stainless steel shower door rollers. These single shower door rollers fit glass shower doors when the distance from the center of the hole to the edge of the glass is 18mm. Package includes: 4 top shower door rollers + 4 bottom shower door rollers Features: - Easy to adjust the height and angle of the door. - These shower door rollers can be used in quadrants, curved showers or straight sliding doors. - The shower door roller is adjustable, easy to install, and the shower door is smoother than before, don't shake or scream! - No need to fish for sheds and plumbers or buy new shower doors. - Kit includes 4 upper adjustable shower door rollers and 4 lower shower door rollers. - Comes with a screw cap. - The spring is also suitable for curved shower doors. - Designed with plastic nuts and covers. Note: Please check the glass hole size of the shower door before purchase. Package: 4x shower door rollers on top 4x shower door rollers on bottom