The Precision I (HF905)I (HF907)I (HF910) Boiler Centre Grate is the correct replacement for your Hi-Flame Precision 3 firebox. As a genuine spare part it is made to the original dimensions, sitting properly in the grate frame and supporting the fuel load through sustained high-heat operation. Replacing a worn grate restores efficient burning and correct ash clearance. Installation requires no special tools.