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Drill bits for acrylic (and other plastic) sheets have a "pointier" tip anlge than a typical twist drill (60° vs. 120° to 135°) to minimise the drill chipping out a mess when it "breaks through" t'other side and chipping in general. Standard twist drills cal b e easily ground to make them into "plasic bits"... Commercial plastic bits often have a rough, sand-blasted like finish on the steep exposed flutes.
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