The Xcelite 9963 Bristol Spline Driver Blade features:
Multiple spline blade style
Blade diameter: 0.069"
Blade/Point Size: 4-flute
All Series 99 blades are interchangeable with all the Series 99 handles. Blades are constructed from high quality steel, hardened and tempered for optimum performance. Plastic handles have a patented spring device that holds blades firmly, yet permits quick, easy insertion and removal.