EXCLUSIVE: Fits for ROLLINGDOG's upgraded 18 inch paint roller frame and roller covers DIAMETER: With Pin hole diameter 0.39 inch (10 mm) STRONG: Made of Abrasion resistant PP REMOVABLE FROM ROLLER COVER: If the diameter is kind of large for your paint roller system, it can be removed or reloaded as per your requirements GET YOUR PROJECT DONE FASTER WITH ROLLINGDOG 18 INCH PAINT ROLLER! ROLLINGDOG exclusive 18 inch paint roller cover end caps refill ( pack of 2)