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Intro: When a Phillips Is Not a Phillips! Cross-head, Cross-Point, Cruciform, Square Drive Screws and Drivers These screw types have a + shaped recess on the head and are driven by a cross-head screwdriver, designed originally ... Step 1: Early Screws.
Crown tooth and spiral blades are two of the most common specialized scroll saw blades. Similar to the reverse tooth design, a crown tooth blades cut both on the up and down stroke. Crown tooth blades are a top choice for extra-smooth and chip-free cuts in plastics.