When you are working in sticky material like clay or under a narrow condition, Spade is a good choice. Spade tools include two types, Frame model and fixed model. Both are available in a variety of widths and sizes for excavators weighing from 1.5 to 20 ton.
Frame model is assembled from spade frame and spade insert. Any width insert could be adapted to fit frame by screwing the bolts, in the other words, you can change any width of the spade insert you like!
Fixed model is designed shallower than a normal general purpose bucket which allows for better release of material in sticky conditions but also provides enough capacity for high production when narrow trenching.
Spade Frame Bucket Specification