APPLICATION RANGE: This toe stopper is used to brake at any time during roller skating, which can slow you down and ensure that you can slide safely. It is suitable for double row skates.It can be used both indoors and outdoors.DURABLE DESIGN: It made of rubber, it has good wear resistance and will not make harsh sounds when braking. It is suitable for most floors such as wooden floors, asphalt floors, and concrete floors. It can brake stably when rolling at extreme speeds,making braking faster and safer .FUNCTIONAL TOOLS: Insert the bottom of the screw into the larger diameter of the brake first. Then use a screwdriver to screw it into the skate. Easy to install without additional tools.PACKAGE INCLUDE: 2 pack of Block Stoppers, 2 pack of Screws, 1 pack of Screwdriver; Material: Rubber; Hardness: 82A; Thread Size: 28mm x 5/16 18UNC (L*D); Diameter: 37mm and 47mm / 1.46 inch and 1.85 inch; Total Height: 34mm / 1.34 inch.NEED ATTENTION: Before ordering, please pay attention to the size.