Universal open-backed design for grout and mortar removal. Compatible with tool-free, quick-change and standard multi-tool machines. Also compatible with Triton, GMC and Silverline Oscillating Multi-Tools, and with most leading brands. Universal open-backed design for grout and mortar removal. Compatible with tool-free, quick-change and standard multi-tool machines. Also compatible with Triton, GMC and Silverline Oscillating Multi-Tools, and with most leading brands.