I've just obtained this model belt sander. I;ve searched in vain for information on the model whichis not recognized anywhere. Looking at the aluminium base it appears to be 100mm (4") wide, but it has another 75mm (3")plate 'clipped' over this base. The drive roller at rear isabout 50mm (2") wide and the front adjustment roller is 75mm (3") wide. The motor is rated at 810watt. Can anyone tell me what size belts I can use? Regards Tom