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Features: Self-Centering spade drill bits for opening hole on wood, PVC, plywood, etc. High hardness, rust prevention, longevity and labor-saving Long handle ensure for fast access to wood, either straight on or at an angle Spade bits use double-cutting spurs that scribe the outside of the hole, reducing breakout Specification: Material: high carbon steel Size: 10mm(0.4”), 13mm(0.51”), 16mm(0.63”), 18mm(0.71”), 20mm(0.79”), 22mm(087”), 25mm(0.98”), 28mm(1.1”), 30mm(1.18”), 32mm(1.26”), 35mm(1.38”), 38mm(1.5”), 40mm(1.57”), 45mm(1.77”), 55mm(2.17”). Set of 15 Handle shape: hex shank handle, suitable for most of electric hand drill. Package included: 15PCS Spade Drill Bits with Plastic Box