Makes a difficult job very much easier, and good deal more accurate to boot! Effectively provides the 'third hand' that would be so useful when trying to use conventional mitre blocks. Trims can be positioned accurately within the block with a much reduced risk of scratching and then very effectively and simply clamped tightly into place whilst cutting takes place - and all by the same one operative. We had 100% accuracy 100% of the time in less time than usual and only occupying one operative. In our opinion it paid for itself in the first day!