Corner Angle Clamp for the FoxAlien XE-PRO. The M6 bolts are on a 90mm hole spacing. I originally made the 20mm wide clamp and after using it, decided to make a 40mm wide one for better placement for clamping my work piece. Corner Angle Clamp for the FoxAlien XE-PRO. The M6 bolts are on a 90mm hole spacing. I originally made the 20mm wide clamp and after using it, decided to make a 40mm wide one for better placement for clamping my work piece.