Simple and effective. These clamps were already on my boat (friendship 28), so I could change the 30 year old clamps for new ones. They are not expensive, but the holding power is no better than reasonable, therefore 4 stars. Take good care of the measure. Of this type with the same name 205 Major, there is also an older version with hole spacing 100mm instead of 95mm for the new one. Of those old there were also 2 on my boat. These can be ordered at the factory in England.