This grinding stone has the following specifications:
Grinding stone (ball-shaped) 1/8" shank diameter by 3 1/2" overall length (stone 1/2" diameter). Our experience has shown that an average of four (4) grinding stones are required for a complete intake porting effort for one (1) engine.
We've taken the guess work out of selecting the appropriate cutting and grinding tools to undertake your engine porting effort. In this section of our web catalog we offer a wide selection of tools that you can select from; refer to the following guide for the quantity and type of cutting tools that are required for a specific porting application. Grinding Tool Application Guide.