Cutting With Grid Work Surfaces Just Got Easier! Waffle Grid Surfaces are a favorite among glass artists. Use these handy Speed Balls to cut glass effortlessly on the grid surface. Place Speed Balls on your waffle grid and in line with your score to easily slide glass. Use the included rubber cap to reposition your Speed Balls in the grid. Ideal for use with Cutters Mate Strip Pro Attachment (item# 5118). Pack includes 12 Speed Balls and 2 caps.