CS-5

A combination of Keyhole Saw Blade and 12.5mm Snap-Off Blade is all needed. The saw blade is bi-directional, works as a pull-saw as well as a push-saw. Its sharp-pointed tip drills a hole in a board to start cutting. The hard-to-bend 12.5mm-wide x 0.45mm thick snap-off blade cuts tough materials stronger than people expect from its appearance.

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https://www.olfa.co.jp/en/products/676.html