This multiple spline drive system is recognized by design engineers as the superior method of transmitting torque.
Reason: nearly 100% of wrenching force is applied at right angles to the load bearing spline surfaces of the
drive systems dissipate a significant amount of force into radial
thrust,tending to expand the socket rather than tighten the screw.
substantial and effective wrench engagement inherent in the Bristol
design addresses the problems caused by other fastening systems such as
cam-out, socket reaming and "rounding" of wrenches.
4 Flute Short Arm Bristol Spline Keys
4 Flute Long Arm Bristol Spline Keys
6 Flute Short Arm Bristol Spline Keys
6 Flute Long Arm Bristol Spline Keys
Bristol Screwdrivers 4 Flute
4 Flute Bristol Replacement Blades
Bristol Screwdrivers 6 Flute
6 Flute Bristol Replacement Blades
ALS-SL-607, Spline Bristol Keys Long Arm Kit
ALS-SS-508, 9pc Spline Bristol Keys Short Arm Kit