A shovel used to sink postholes WordNet 3.0 & Open English WordNet

A post hole clam-shell digger, also called post hole pincer or simply post hole digger, is a tool consisting of two articulated shovel-like blades, forming an incomplete hollow cylinder about a foot long and a few inches wide, with two long handles that can put the blades in an "open" position or a "closed" position. Wikipedia

Tool used to dig vertical holes in soil Wikidata

tool used to dig vertical holes in soil Wikidata