Porter Cable PTD501 1/2" Reversible Drill. The PTD501's highly polished aluminum body combined with black accents will grab your attention, but the features packed into this 1/2-inch drill will surprise you. The high-torque motor turns the chuck up to 500 revolutions per minute (rpm) at 90 pounds per square inch (psi). The convenient keyless chuck allows you to change bits quickly, while it's 3-jaw steel chuck holds bits tight.