PGSS sign for NAIL2

NAIL2 (small metal spike)
Hold 1st hand as TOOL, and hold 2nd CLOSED hand, back forward-outward & fingers forward-inward, one hand's breadth above tips of thumb and 1st finger of 1st hand; then move 2nd hand downwards till mid knuckle of its 4th finger touches tips of thumb and 1st finger of 1st hand.
[Compare RIVET]