I knew the quantities of the sizes going in from the reviews on here.  The quality of the metal part of the splice is about average. The metal is not as thick as some competitors premium stuff.  The heat shrink sleeve environmental seal is premium quality though.  Thick and seals well.  If you have an el-cheapo heat gun you will take extra time to shrink it.  I am using these on the boat and have confidence that the seal will not leak and allow saltwater to corrode the crimp.