Choose Options Quick view 63/64" Cobalt Steel Taper Length Drill Bit Qualtech List Price: $301.16 Now: Price: $159.61 List Price: 63/64" Cobalt Steel Taper Length Drill Bit. Cobalt taper length drills are made of heat resistant M35 5% cobalt. Features heavy duty construction for drilling in tough alloy steels, forgings and castings DWDTLCO63/64 List Price: $301.16 Now: Price: $159.61 List Price: Choose Options Quick view Qty in Cart: 0 Price: List Price: $301.16 Now: Price: $159.61 List Price: Subtotal: Choose Options