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The CorePlus Hole Saw Arbor & Starter bit 32-114mm features a groundbreaking, patented retractable starter bit. With a specially designed tungsten carbide tip that gives long life, penetrates hard materials and eliminates slippage. Provides accurate centring and removes the need for a traditional pilot bit. No pilot hole drilling is required. Promotes easier core removal for fast, multiple hole cutting.Additional Information:• Accessory Type: Arbor