ANGLEFIX Trend Mitre Guide for internal & external angles halves the angle for mitre joints ideal for using on mitre cutting of frames, skirting, architrave and beading as well as basic marking out, halves angles to achieve correct cutting angle before cutting mitres, use for mitre cutting of frame, skirting (not tall skirting), architraves and beading as well as basic marking out, sets internal and external angles, can be used with hand mitre and snip-off saws