Apex® Frearson bits, also known as Reed and Prince bits, are used extensively in aviation maintenance and repair and in marine hardware applications. While the Frearson bit is similar to a Phillips bit, Frearson bits have a sharp tip and larger angle in the V shape then a Phillips.
The Frearson drive recess is a perfect, sharp cross, allowing for higher applied torque, unlike the rounded, tapered Phillips head, which was designed to cam out at high torque.
The Frearson recess is designed so that any size Frearson bit will fit any size recess. When choosing a Frearson bit, select one on the basis of its' body diameter. The larger the screw, the larger the body diameter. Apex's® premium tool alloys and proprietary heat treat help avoid typical problems such as shattering and premature bit wear.