The answer is: When dry-stacking a stone wall, you need these items: a stonemason’s hammer, gloves, flat stones, and gravel.
Two observations. First, every sentence needs to start with a capital letter.
Second, the word that follows a colon, that is the symbol characterized by two dots on the same vertical line, is written in lower-case, unless it needs to be capitalized for some specific reason like the word being a proper noun or an acronym.
A colon basically means “that is to say”.
