A Fork-Like “What am I?” Quiz

Nikon D4 + Nikkor 24-70mm f/2.8 @ 70mm — 1/160 sec, f/4.5, ISO 6400 —
map & image data — nearby photos

What am I?

これ何？

I came across these fork-like tools on a craftman's workbench, and
thought they'd make a good
“What am I?” Quiz.
What, exactly, are these fork-like tools used for?

クゥイズ：この工具は何のためでしょうか？