Universal open-backed design for use on plasterboard, wood and plastic. Ideal for fitting twin-gang dry-lining boxes, metal boxes and pattresses. Compatible with Silverline, GMC and Triton Oscillating Multi-Tools, and also tool-free, quick-change and standard multi-tool machines. Universal open-backed design for use on plasterboard, wood and plastic. Ideal for fitting twin-gang dry-lining boxes, metal boxes and pattresses. Compatible with Silverline, GMC and Triton Oscillating Multi-Tools, and also tool-free, quick-change and standard multi-tool machines.