MJ urethane flat lap for pumice pre-polishing on glass. The extruded urethane carries fine fibres that generate friction against the glass surface, while its open pore structure holds the pumice in place — giving a fast, controllable rough polish right across the lap.

The 30 inch lap is the large-format size for production flat lap grinders.

• Diameter: 30 inch
• Thickness: 2-3/4 inch
• Use with: pumice
• Fits: flat lap grinders

Part of the Flat Laps for Pumice range — see all six sizes, a comparison of felt vs MJ urethane, and how to get the best out of them.