The Crescent 12" Duckbill Pattern Tinner Snips, part WDF12D. Supplier specification: SNIP TINNER DROP FORGE 12" DUCKBILL.
Aviation snips are handed. Left-cut turns left, right-cut turns right, and straight-cut runs straight — the colour on the handle tells you which. Using the wrong hand of snip forces the offcut into the work and gives a ragged edge.
