Broadforks are excellent for breaking open compacted soils deeper than a rototiller or a spade. The 12" tines are 2" longer than the main competitor's broadforks. You don't have to sink them down to the tread bar, but you can. It is best to broadcast compost and soil amendments prior to broadforking, as the amendments will trickle prior to broadforking, as the amendments will trickle down into the cracks. This is especially useful for rock phosphate, since phosphorus is leached very slowly.
The 1/2" tines are reinforced with 3/16" welded steel gussets. These strengthened tines are much more resistant to bending than most broadfork tines.
The five tine model has 4.5" between tines, so the tine width is 18". The four tine model tines are 5.5" apart, with a tine width of 16.5". Add $15 for 5 tine model.