HTC Twin-Button Metal Bond Grinding Block for HTC Floor Grinders:Primary heavy-duty grinding tool designed for high-hardness concrete and challenging surfaces. The MHF (Metal High-Frequency) formula provides superior wear resistance and aggressive cutting power to strip thick epoxy/polyurethane coatings and remove concrete laitance during the first stage of floor renovation. The oval segment design ensures smoother grinding action while maintaining exceptional material removal rates. Must be followed by medium-grit resin pads for scratch smoothing and final polishing