Century Drill & Tool. 25628 Charger Parabolic Pro Grade Drill Bit, 7/16″, 3/8″ Shank. High Speed Steel, Alloy Steel. 5.5 x 0.44 inches. Wood, Plastic, Metal, Steel. The unique flute design allows for fast chip removal to ensuring the cutting point remains cool to reducing wear for a longer cutting life. Industrial heavy duty web provides added stability and strength for exact holes while drilling in the hardest materials. Designed for drilling in wood soft metal mild steel and plastic. Made in the USA. Brand New and Never Been Used! Still in Original Packaging. We here at CBM TOOLS strive to provide 5-STAR Service every day. Your personal satisfaction is guaranteed on all products we sell.