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1. Countersinks – Countersinks are a type of cutting tool used to create conical shaped holes in metal and other materials, usually with a drill. They can be used to form flat bottomed or countersunk screws, allowing for a flush mount of a fastener. 2. Reamers – Reamers are designed to size, smooth and enlarge existing holes. They are available in a variety of types, such as spiral fluted, straight fluted, expanding, taper pin and work reamers. 3. Spotting Drills – Spotting drills are specifically designed to pilot a hole before tapping or drilling, to ensure accuracy and prevent wandering. Its unique design allows for initial drilling and spotting in one step. 4. Combination Drills – Combination drills are a type of universal cutting tool used in metal cutting operations. They combine drilling, countersinking, and reaming all in one tool. They are ideal for drilling and deburring holes in plates, flanges and other items.