: Used for drilling in woodworking in preference to drill bits and flat bits whenever a very clean and precise hole is required Enable woodworkers to drill holes without passing through the material when a clean and precise bottom to a hole is required 2 Flutes Designed to make professional flat bottom holes, and clean through holes Can open any hole on various wood products, plastics, plywood and other materials Designed to make professional, flat-bottom holes and clean-thru holes Specification: Material: Carbide Alloy Color: Silver Total Length: Approx. 7.5cm/ 2.95inch Size Chart: Top Handle Dia. : 7mm/ 0.31inch; Tapping Dia. : 15mm/ 0.59inch Top Handle Dia. : 8mm/ 0.31inch; Tapping Dia. : 16mm/ 0.63inch Top Handle Dia. : 7mm/ 0.28inch; Tapping Dia. : 17mm/ 0.67inch Top Handle Dia. : 8mm/ 0.31inch; Tapping Dia. : 18mm/ 0.71inch Top Handle Dia. : 8mm/ 0.31inch; Tapping Dia. : 19mm/ 0.75inch Top Handle Dia. : 8mm/ 0.31inch; Tapping Dia. : 20mm/ 0.79inch Top Handle Dia. : 8mm/ 0.31inch; Tapping Dia. : 21mm/ 0.83inch Top Handle Dia. : 8mm/ 0.31inch; Tapping Dia. : 22mm/ 0.87inch Top Handle Dia. : 8mm/ 0.31inch; Tapping Dia. : 23mm/ 0.91inch Top Handle Dia. : 8mm/ 0.31inch; Tapping Dia. : 24mm/ 0.94inch Top Handle Dia. : 8mm/ 0.31inch; Tapping Dia. : 25mm/ 0.98inch Top Handle Dia. : 8mm/ 0.31inch; Tapping Dia. : 26mm/ 1.02inch Top Handle Dia. : 8mm/ 0.31inch; Tapping Dia. : 28mm/ 1.10inch Top Handle Dia. : 8mm/ 0.31inch; Tapping Dia. : 30mm/ 1.18inch Top Handle Dia. : 8mm/ 0.31inch; Tapping Dia. : 32mm/ 1.26inch